RSS search engines

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Search Engine Watch has published their second part of a series of articles on RSS

The latest piece takes a look at the specialized RSS search tools that help you locate content in blogs and feeds:

"Many people
mistakenly refer to RSS search as "blog search." While it's true that
many blogs offer RSS feeds (automatic feed creation is a feature of
most blogging software), not all blogs have feeds. Furthermore, RSS can
literally be used with just about any kind of web-based content. RSS
fundamentally is a relatively simple specification that uses XML to
organize and format web-based content in a standard way. "

I use these sorts of services in a couple of ways.

The first is the ego-tracking. I'm interested to know who's pointing to / slagging off my posts. For this I use Ice Rocket, PubSub and Technorati (the latter not linked to, as it is having kittens, again - will add later).
I track the search results via RSS. Why use three engines?
Well, no single engine seems to capture the all of the resources
available and catch all of the references out there, so this is about
getting comprehensive.

The second main use I have for these RSS
search engines is to track thoughts/coverage on news and
topics. An example was yesterday's WinFS news. It's great to be able to track the blogosphere in close-to-realtime and monitor reaction closely.

As it happens, the 'WinFS' search
made it to Technorati's top ten search items throughtout yesterday. In
fact it made the nine spot on Monday evening, then eight
spot by Tuesday morning. By last night it fell off the list.

Screenshot of Technorati homepage, Aug 29 2005

List of RSS search engines, courtesy of SWE:

As Chris Sherman's article
points out, there are notable names missing from this list: no MSN,
Google or Yahoo. No doubt this will change, but in the
meantime there are some smart, small companies doing some
very cool stuff dominating in this space.

Update 14 Sept 05: Seems RSS / Feed searching is confusing, I agree.