It's a ringtone site (think YouTube for ringtones) where users upload stuff. You find one you like, click "send to my phone" and you get a text message with a download link. On other phones, you click that link, and the download begins. On WP7, you click the link, and IE opens up and asks if you want to play the file.
Is IE restricted from downloading MP3's?
Is IE restricted from downloading MP3's?