Collecta
Collecta calls itself "real-time search." It focuses on searching blogs, Twitter, news sites, etc. rather than more static web content.
e-Learning Reloaded: Top 50 Web 2.0 Tools for Info Junkies, Researchers & Students | OEDb
Collection of 50 Web 2.0 tools in categories: organization, bookmarks & citation, communication, money & numbers, search, & learning. From OEDb (Online Education Database)
midomi
Search for music by singing or humming part of a song. All you need is a microphone.