I just stumbled across a new (?) feature on Google – Google Sponsored Links which allows you to enter a term and then see what ads Google has in their stock pile.
The initial page that you go to looks like you’ve come to an error page but enter in a term in the search bar and you’ll get a list of ads that they have. For example here are ads on the topic of Blog Money and here are some for Digital Cameras
The results do seems to vary depending upon your location (I get a lot of Aussie ads). This would be a useful tool for you if you’re deciding on a topic for a blog and you want to run Adsense Ads. Check your keywords/blog topic on this tool and you’ll see if there are sufficient ads to make it worth your time. If your keywords don’t produce any ads it might be worth changing your approach or finding another income stream as it will be hard to get ads served to your blog and therefore difficult to extract any money from Adsense.