According to this post on Slashdot, some Gmail users are seeing a “Web Clips” part at the top of their Inbox. Evan Williams, formerly of Blogger, posted this screenshot and has this to say on his blog post about Gmail RSS:
You can add your own feeds and/or choose from their selection. It also swaps between feed headlines and ads, which is pretty clever, cuz it gets you looking at the ads a lot more (I've found). Each is labeled, of course. Nice.
I haven’t seen this on my Gmail account, which means that they have not activated it yet for me (that would be the same reason many of you haven’t seen it) — can’t wait to play around with it.