Google just launched their AdSense API. This API lets web site owners embed AdSense controls into their website. A web service like Blogger could use this to allow its users to customize their AdSense settings on their own weblogs, without forcing them to make a round-trip to Google's AdSense site just to cut and paste code into their blog template.
Here's an excerpt from the AdSense API page on Google:
The AdSense API is a free beta service that enables you to integrate Google AdSense into your website offerings. Using the AdSense API, you can enable users to perform a variety of AdSense functions without ever leaving your website. Users can create or manage their AdSense accounts, modify their AdSense ads, and view ad performance and earnings reports.
The AdSense API is ideal for developers whose users create their own web content through web hosting, web publishing, blogging, and social networking applications.It's a great idea, making this available as an embeddable service. I'd like to see Amazon do this with its affiliate program.