Have a look here
http://www.misticriver.net/I dont own an IFP player but it apears it has UMS support Firmware now so you can simply drag and drop it of your player onto your pc, then do whatever you want with it.
Obviously there could be legal copyright implications on making certain material available for distrubution.
edit..
Just read the faq and it says this
Q. Why can’t I upload my MP3 / WMA files from my iFP player?
A. Due to copyright protection laws that apply towards our technology, media files (MP3 / WMA files) cannot be uploaded from an iFP player to a PC. All other non-media files (documents, images, etc.) can be uploaded to a PC from the iFP player.
wtf gay... but then spotted this at the bottom of the page
*Due to Copyright laws, MP3 / WMA files cannot be uploaded from an iFP player to a PC using our iFP player and software application iRiver Music Manag
So i recon you can copy mp3's off that player unless you are using iriver music manager. (just like you can with ihp140)
wish i hadnt comented now