I've been trying to lay off slagging on their service, but the case against Technorati, as Jeneane Sessum points out, is building. I never quite understood the attraction since Technorati search results are typically unintelligible to me and the number of compelling apps that rely on Technorati's services is vanishingly small.
I'll have to see how Feedster, WayPath, Blogdigger, et. al. are doing these days, but despite obvious appearances there's probably still market opportunities in webfeed oriented information retrieval services.