*Apple iTunes -Downloadable program for Mac and Windows.
*Rhapsody -Downloadable program for Windows, based more towards playing/streaming/listening than downloading.
*eMusic -Subscription service where members can download up to 40 tracks per month of high-quality MP3 files.
*Amazon -Yep. They now have an mp3 store!
*Napster -Downloadable program for Windows. Yes it's now legal and paying.
*Verizon V-CAST -V-Cast Music Store is Verizon's digital music service that can be accessed on a PC and on new Verizon phones. V-Cast includes music from the major record labels and independent artists.
*Liquid Digital Media -Liquid exclusively provides music for Wal-Mart's digital download store.
*PayPlay -PayPlay is a download store that provides widgets and focuses on independent music. It’s available for Windows users and requires no registration or software download.
*AudioLunchbox -One of the first all-independent music download sites.
*GroupieTunes -GroupieTunes is a service that sells independent music online and via mobile phones. Customers can purchase ringtones from their phones and have the charges included in their cell phone bill.
*Ruckus -Ruckus is a subscription download service designed exclusively for colleges and universities. Participating schools pay a monthly subscription fee to provide their students with all-you-can-eat "tethered" downloads.