Are there any portable players that play Musepack files? Most of my music I encoded with musepack, and I'd rather not reconvert all of it, and besides I really like Musepack insane, sounds the same as FLAC to me at 1/2 the size.
At the moment? No. But Rockbox is currently working on 3rd party firmware for the iriver ihp-120 and 140 that will play Musepack among several other formats. It looks promising as they just recently got mp3, ogg, ac3, flac, wav, and wavpack playing.