Same here really. I've never really bothered with AdSense. There's about $150 in there at the moment. Will be using AdSense very heavily on an upcoming project.
I personally dislike AdSense and wouldn't put it on any site that means anything to me - unless they're well integrated. There's a couple or so on TalkPHP somewhere. Not that PHP has a high CPC, and because you're all programmers and so computer-wise, you'll never click any adverts that don't attract your eyes and so CTR is low, too. They're just content-fillers really until TalkPHP becomes large enough to have paid advertising - to which we have a couple at the moment. At least TalkPHP is now into the top 100,000 on Alexa!
For AdSense to succeed you need to target a computer illiterate niche.
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