Note: this post is from 2007, outbound links may be broken.
Adsense Sandbox – Google Adsense preview tool
Adsense Sandbox website screenshot
Type any web page URL (e.g. cnn.com) or keywords (e.g. paris hilton), select a country (optional) and hit Enter to see the latest Google Ads that are contextual and geo-targeted.
The preview will show 20 text ads, related Adlinks and Rich Text Ads (Images and Video) that will appear on your webpages for visitors in various countries.
Very handy if you’d like to see what type of ads will appear on your website. Adsense Sandbox works across all web browsers including IE, Firefox, Opera or Safari.
Check it out here.