USB Equipped Radio\CD Player ?

I have a Zen Micro MP3 device. It just occurred to me that there might be some portable/desktop/shelf sound systems that are equipped with a USB port. Upon some initial research, I discovered a few. Now, I really know nothing about this particular topic, so of course, I came here to ask.

Do any of you learned Major Geeks know of any moderately priced devices that would work well with a Zen Micro? Or is it to early a development to invest money into?

I know the iPod has some docking stations, but I am looking for something a little more versatile - plus I do not own an iPod (that would be the wife).

Thanks for any input.