Rockbox open-source firmware, but more importantly, Rockboy

iRiver Rockbox

You're the type to wipe the firmware on your hard-earned MP3 player and reinstall with something a group of complete strangers whipped up, are you? Well then, get a gander at Rockbox, the open-source Archos firmware with ports to iRiver and and even the Gmini—oh, and did we mention it's got a plugin called Rockboy that lets you emulate original Gameboy games on your iRiver? (Guess that means it's only a matter of time before that feature gets added to the iPodLinux Pproject, then.)

[Via DigitalMediaThoughts]