I Love eMusic
I've been an emusic member for a while now; I didn't think it had been that long, but I checked my account and it's been almost exactly 3 years since I first signed up.  I really like the flat-fee model for music services; it forces me to spend money on something I love (music) without having to think about it or sign off on every little decision.  I also signed up for Rhapsody a few months ago and have found I enjoy that service too; I used Yahoo Music for a while but the player just sucked more than any other piece of software I've ever been forced to use, and then they dropped Windows 2000 support (back before I got my new machine), so that sealed the deal.

eMusic is great, though, because it's such a discover site; there are just a ton of things I wouldn't ever have been a fan of it wasn't for just going on eMusic and checking out the most popular albums for the month, or the newest additions.  My latest acquisitions are by Crystal Castles, Cut Copy, Titus Andronicus, and The Weepies.  All bands that I might have come across via some reviews on Pitchfork or metacritic, but potentially never would have really listened to had they not been on eMusic.