Things Of Sorts informs that Yahoo! SERPs now embeds API RSS feed.
"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"."
Well done, Yahoo!