Adsense - Tips & Trick Part 2

Tip #1: Don't put ads on empty pages.
When I reworked my site, I built a skeleton set of pages that had no content, just titles and some meta tags. I displayed ads on those pages, however. Although all you see are public service ads at first, the very act of displaying ads on a page causes the AdSense web crawler to quickly fetch that page for analysis. A page with good content will thus begin showing relevant paying ads fairly quickly.
If you don't have any content, then, Google will have to guess as what your page is about. It may guess wrong, and so the ads that it displays may not be relevant. You'll have to wait until Google re-crawls the site for the ads to correct themselves. Here is what Google had to say when I asked them about how often the AdSense crawler updates a site:
Thank you for taking the time to update your site. New ads will start appearing on your site the next time our crawler re-indexes your site. Unfortunately at this time, we are unable to control how often our crawlers index the content on your site.
Crawling is done automatically by our bots. When new pages are added to your website or introduced to the AdSense program, our crawlers will usually get to them within 30 minutes. If you make changes to a page, however, it may take up to 2 or 3 weeks before the changes are reflected in our index. Until we are able to crawl your web pages, you may notice public service ads, for which you will not receive any earnings.
It's better to flesh out the page before you start displaying ads on it.

Tip #2: Don't be afraid to ask questions
If you're wondering about something, don't be afraid to ask Google. So far, they've always responded to my questions within a working day. There are two email addresses to use, depending on the type of question:
Please feel free to email us at adsense-tech@google.com if you have additional technical questions or concerns. For general program or account questions, please email adsense-support@google.com.
Their responses are always very polite, and they appreciate getting problem reports and suggestions.

Tip #3: Avoid non-English characters on English pages
This one is a bug, to be honest. My surname is French, and I prefer to write it out correctly with the accent grave on the first "e". Every page on my site would then include at least two accented letters, because my name shows up twice in the footer. On some pages my name shows up two or three more times.
Normally, this wouldn't be an issue. But on some pages the presence of the accented characters is enough to cause AdSense to display non-relevant ads in French. This happens whether the browser indicates a preference for French or not. When I reported this to Google, this is the answer they gave me:

Hello Eric,
Thank you for bringing this issue to our attention.
We are currently working as quickly as we can to address this problem. As soon as we have more information for you, we will email you again.
We appreciate your patience.
Sincerely,
The Google Team

Until this is resolved, I've decided to strip out all accents except on the pages that are actually in French.

Tip #4: Check your keyword density
Although Google doesn't release exact details as to how they determine the ads to serve on a given page, they do tell us that it's the text content of the page that matters, not the meta tags. Before serving ads on a page, then, you might want to check its keyword density. A good, free tool for doing this is found here: http://www.ranks.nl/tools/spider.html
This lets you fine-tune the page before exposing it to the AdSense crawler.

Adsense Know How

Top AdSense Tips:
1. Niche SitesTargeted niche sites that have a clear theme, tend to generate more advertising revenue simply because it is easier to achieve decent search engine placement. Be warned though, you want to chose a niche where there is a sufficient number of advertisements available.

2. Target KeywordsWhen determining the site's focus, consider how much the advertisers pay for the advertisements. If the site is focused on ringtones, like Ringtone Central , the payout per click is going to be very small. Because ringtones are not high ticket items, advertisers will not spend a lot on pay-per-click advertisements. With less obvious markets, use Overture to determine how much advertisers pay per keyword. The cost will usually be similar on Google. Search Overture for a keyword then click "View Advertisers' Max Bids" in the top right corner. This will show the Overture inventory and how much is paid per keyword. Because the market has become very competitive, it will be difficult to rank well in search engines with a new Web site that is optimized for the terms that have the highest payout. Consider targeting terms that are moderately priced.

3. Aged Sites / TimeOver time, as a Web site is spidered by Google, advertisements will generally increase in relevance. In general, older Web sites will rank better in search engines. The closer the advertisements relate to the Web page's content, the higher the "click-through" the publishers will see.

4. CodingIn order to minimize a Web site's maintenance, place the Google generated AdSense code in the Web site template or an "include" file. This will allow you to easily experiment with different advertisement sizes and ad placement, and keep the Web maintenance to a minimum.

5. Tracking ChannelsIn order to know how effective a specific Web site or ad placement is, use distinct channels and subchannels within Google. This will allow you to discern what performs best on a specific Web site. Using channels will tell you what sites are making money, what advertisements are making money and what ad position is the most profitable on a specific Web site. Keep in mind that you should run an advertisement for a full week, in order to properly test its effectiveness, different days of the week will vary the Web traffic so comparing one week to another will give the most accurate reflection of how effective a campaign performs. When testing different advertisement sizes, placement or color schemes, be sure to leave campaigns in place for one week. Different days will often result in Web traffic fluctuations. Comparing Web traffic week to week will give a clear indication of what ad formats perform the best.

· Integrated Ad PlacementMany webmasters have been successful at integrating advertisements into a Web site. The easiest way to integrate an advertisement into a Web site is to remove the advertisement border. This will allow the ads to better blend with the Web page. Google recommends contrasting the link colors with the Web site colors to increase click-throughs. It is also suggested that webmasters randomize the color of the advertisements, so that frequent users will not naturally "filter" the ads.
example of integrated ad placement: http://www.golf-clubhouse.net/ or http://www.security-protection.net

· Number vs Value of AdvertisementsUp to three advertisements can be listed on each page.

· Hot SpotsLike Web copy, "above the fold" holds true with AdSense as well. This means that advertisements that appear without having to scroll will be read more frequently. Hot Spots are areas on a Web page that result in a higher percentage of click-throughs. According to Google, the highest paying advertisements are located on the hot spots.
hot spots map - http://www.small-business-software.net/heat-map.htm
Google does not indicate if image advertisements or text ads perform better, so webmasters are encouraged to experiment with both.

· Highest performing Ad SizesAccording to Google the 336 x 280 rectangle, the 300 x250 rectangle and the 160 x 600 sky scraper result in the highest number of click-throughs. Depending on the website's design and layout, publishers may experience different results with different ad sizes, placements and color schemes. Expirement and track the results for each website to maximize the AdSense payout.

Soure: http://onlinebusiness.about.com/od/advertising/a/adsensetips_2.htm