I wrote earlier of issues some have with Google running house ads for its own products in Google search results. Selling Their Own Dog Food from Andrew Goodman looks at the flipside, Google house ads running in AdSense ads on sites outside of Google. "I wonder if publishers get paid for these clicks?," he asks. Good question -- I'll see if I can find out. It seems like they should.
Postscript: Chris Ridings writes to say, nope, Google doesn't pay for those ads. See section 11 of the AdSense terms:
Google shall not be liable for any payment based on....(d) Google advertisements for its own products and/or services;
Postscript 2: Jen Slegg emailed me and also posts on her blog that publishers ARE PAID for these ads, according to what Google tells her. Andrew's also posted a follow-up saying he's been told the same.