My friend Sanders and I just launched an awesome, free app on the Android marketplace. It's called Vibe Vault and it lets you stream and download songs from archive.org. Archive.org has over 84,000 free recordings of concerts. The collection spans over 8,000 Grateful Dead shows, and includes a diverse collection of other acts from Lotus to 311 to Elliott Smith.
I use this app every day. On my way to class, I stream shows. I download entire shows (and sometimes single songs) and listen to them on the subway when I have no cell connection. Who needs to buy music or use an iPod when you can listen to FREE music by great artists on your phone? Check it out and let me know what you think.
If you want to check out my buddy Sanders' page on Vibe Vault, you can find it here.