Forum Moderators: martinibuster
2. Implementation; Ad Placement. ...stuff..stuff... In addition, You agree that only one (1) Ad Unit shall be displayed on each Site. ...more stuff...
Does it really mean that - just one ad unit per site? What about a site that has loads of different topic areas? What about a forum?
I really am not at all clear about that one.
Google mentions putting ads on "pages" at several locations:
How quickly will Google AdWords™ ads start appearing on my site?
After being accepted to the program and successfully pasting the AdSense HTML ad code into your web pages, ads will start running on your site within minutes. If your site is not yet in our index, it may take up to few hours or more before we are able to crawl your site. Until we are able to crawl your site, we may display public service ads, for which you will not receive any earnings.
Do you guarantee to have relevant ads for my site?
Since the ability for us to serve ads on your site depends on a number of factors, such as our ability to crawl your site, the content of each of your web pages, and the availability of related AdWords ads, Google does not guarantee that we'll always have relevant ads to display. If we don't have relevant ads for a given page, or if we haven't yet crawled your site, we may display public service ads for which you will not receive earnings.
(above from their FAQ, emphasis mine)