U2 - Breath (30 seconds clip) I just can't get enought of this damn clip, as well as Magnificient's one
Bloom - the iPhone app by Brian Eno. The sounds it makes are so nice and relaxing. Interesting way to listen to music. If you've got an iPod touch or iPhone, it is well-worth the download.
Nine Inch Nails - Ghosts I - IV - if you don't have this already, it is highly recommended. Something completely unexpected yet awesome.