I have it since its release. Module Player is awesome and works in multitasking.
It's also often updated. I like it a lot. (even my mods are listed lol)
If the price was 10€ I would have paid for it !
iMod is free but no database ans user interface soso...(I don't think it support iOS4) but play the .mod as well)
Talking about music, here is a link of my remixes :
[ Show youtube player ]