Something I've never seen before. In Firefox, I noticed that the Yahoo! SERPs are now showing the feed icon. For example, the search for [seo blog] embeds an API-based RSS feed of the query. Interestingly, the app identification (a required field for all API calls, and is supposed to be developer specific) is "yahoosearchwebrss".

I tried this for a few searches, both simple searches, like [seo blog], and more advanced ones like [inurl:ekstreme.com]. It's showing up for the UK-locali(s)zed old SEPRs interface and the newly redesigned one.

I'd like to say this is a very cool idea, one to be filed under "Why didn't I think of that?" Well done Yahoo! for another innovation in SERPs.