Just saw an ad in the new MacWorld. emusic.com is giving away 50 free downloads for registering with them; credit card required. Fine print reads: Start downloading your FREE MP3s today and take two weeks to decide if you like eMusic. If you're not 100% satisfied simply cancel before your trial period ends and you'll never pay a dime. Keep the 50 FREE MP3s as a gift just for checking out eMusic. www.emusic.com Anyone have any experience with them?