You can give Feedster a link to an OPML file - containing your feed subscriptions (for example) - and limit a search to only those feeds.
There's also a Feedster Hacks blog, and the deadline for the Feedster Hacks contest has been extended to Dec 14th.
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But wait a minute -- they should of course produce a RSS file of the result, and make the search persistent, like a RSS filter over a set of blogs.
They could, but you can already run a search filter over new posts in most feedreaders, so it's not really necessary.
Sure -- it only depends on where to draw the line between desktop and server. Cool tools you are producing, btw.