http://www.garageband.com/
Great place to hear lots of new talent in almost any genre

http://www.simulacrarecords.com/hyoshi.html
Hear samples from the great new ambient artist Gentoo

http://www.eslmusic.com/artists/aubele/aubele.html
This guy is just plain awesome

http://www.imonstermusic.com/
Stinking brilliant band!