Didiom has just launched a self-titled free service that allows you to preview and purchase music from your Windows Mobile device. Didiom works by tapping into participating music stores so they do not have to maintain their own music library.

Content is delivered in MP3, WMA, or WMA Pro, with the wireless version at 64kbps and the PC version at 128kbps to 320kbps.

Didio is running a couple of promotions until May 1. If you are one of the first 1000 users to register an account you can get a coupon code for a free music download. Also, if you purchase ten tracks you get one free.