I'm sure a lot of you already know about this, but XLR8R magazine has free downloads that are supporting a lot of good people, but if you don't have the time to sift through to find the things that are worthy - here are some of my favorites!
The Glitch Mob
xlr8r.com/podcast/2007/10/ex ... glitch-mob
Mochipet (Gotta love the dinosaur costume!)
xlr8r.com/podcast/2009/01/mo ... -city-reco
xlr8r.com/podcast/2009/01/fu ... azer-sword
Mary Anne Hobbs (Live set from San Fran)
xlr8r.com/podcast/2009/02/ma ... -f-january
...and lots more - download MP3s or as a podcast - check out the "MP3" section as well, has lots of single tracks worth listening too!