Just saw a program on BBC regarding a new engine called Blinkx. Has anyone tried it yet, seems that you could be at risk of losing privacy, due to it reading the document you have oopen at any time on your desktop. Has anyone got any views? Also seems to look at keyword density as a relevance factor?!
The privacy issue aside, I think it's very useful, always very accurate results since I've started using it. A really cool feature is the text selection; when you select some text, the toolbar refreshes with related sources to the selection. Unfortunately non-IE browsers aren't supported at the moment, and it loses major points for opening a new browser window everytime you click a result.