] This Kleptones (now, that's a band-name) have released a
] mash-up of the Flaming Lips's "Are You a Hypnotist",
] Martin Luther King's "I Have a Dream" and Public Enemy's
] "By the Time I Get to Arizona" kicks ass. 4.7 MP3 Link

Highly Recommended. I wish I could find more quality mashups like this.

Boing Boing: A Directory of Wonderful Things