This is a link to a great blog I found on the subject of adsense advice. There's a great list of tips to help you with the adsense program and actually make some money with it.

The link is below. Probably the best piece of advice at the site is that the best converting (ie, the most clicked) ad format is the large rectangle(336x280). The ads that get clicked the most, you want most visible on your page.

Read a little more.

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Adsense Video Tutorials - this is one of the best Adsense programs out there. It's a series of videos that will teach you the insider knowledge of how to make serious money with Adsense. The guy who created the program makes $19,000 a month.