here. Unlike most (all?) legal download services, emusic has no DRM whatsover. You download the .mp3 and it's yours to do with what you want. It runs on a monthly subscription service - starting at $9.99 for 40 songs/month - though I believe (make sure you check the fine print on this one) there's no commitment period and you can cancel at any time. They don't have most of the latest and greatest from the major labels, but they have some interesting back catalogs and a lot of great indie stuff.I keep meaning to plug them anyway, but I figured I might as well sign up to the affiliate program and take a cut. Right now they're offering a free trial - 50 free songs in 14 days - so you can check it out. I assume it's one of those if-you-don't-cancel-in-14-days-we-charge-your-credit-card deals but as there's no long commitment involved if you forget to to do that you won't be locked into something forever.
I like the subscription model as I end up trying a bunch of random things when I'm not sure what to download.
Give it a try if you're interested.