Similar to Dylan's earlier post on keeping current with libraryland issues, enter LIBWORM (in beta), billed as a "search engine, a professional development tool, and a current awareness tool for people who work in libraries or care about libraries."
LIBWORM uses over 1400 RSS feeds from sources like blogs, podcasts, and websites that discuss libraries. Similar to Google's interface, LIBWORM can also be searched according to categories and subjects. Naturally, you can subscribe to each category or subject via RSS.
It's a search enginus for the rest of us (apologies to Seinfeld's now classic holiday episode)!