I came across the article today in Advertising Age (via a Wall Street Journal link).  The article hints that this is the first step toward advertising showing up on iPods.

I’m not surprised.  It was inevitable that advertising would show up on iTunes.  I’d been hearing it in some of the podcasts I listen to already.  I wouldn’t expect Apple to turn down that revenue stream forever.  It’s still a little sad that there’s one more place we can now expect to see ads.