The announcement at the Microsoft Team RSS Blog has a picture of the new RSS icon that will be standard in IE7.
Look familiar? If you use Firefox, you’ll recognize it instantly. In fact, those who want to see all-out war between IE and Firefox might be disappointed by this report:
I’m excited to announce that we’re adopting the icon used in Firefox. John [Lilly] and Chris [Beard] were very enthusiastic about allowing us (and anyone in the community) to use their icon. This isn’t the first time that we’ve worked with the Mozilla team to exchange ideas and encourage consistency between browsers, and we’re sure it won’t be the last.
We’ll be using the icon in the IE7 command bar whenever a page has a feed associated with it, and we’ll also use it in other places in the browser whenever we need a visual to represent RSS and feeds. Look for more details on the look and feel of IE7 when we post the public pre-release build next year.
A little more background here.
Ed Bott 
Yeah, and another blogger’s already set up a whole web site devoted to the li’l chiklet: feedicons.com.
Hey, Firefox and IE don’t have to fight… so long as IE keeps bowing to Firefox like this. 😉