MP3 interfaces are not standardized and, unfortunately, Apple's Ipod interface is the industry darling, rendering everyone else's a red-headed stepchild. It won't recognize anything except an Ipod.
Your best bet is using a stand-alone A/V dock into an aux input on your receiver. Some come with a remote control and a component video output so they can compliment your system. I was able to easily find one on Amazon for my 80 gig Zune.