Try this out: IceRocket.com

[General]

http://www.icerocket.com

Searches Twitter, Blogs, MySpace, the Web, News, Images and other sites - has an advanced search link also -

Seems pretty cool!

[Alexander Fedossov]

Looks good.

Do you know this one? http://socialmention.com/

[gary cozin]

Looks good also, Alexander-

However IceRocket also searches Twitter - you could actually all of someones Tweets!