This has been around for some time, and I don’t know if it is ever going to be updated or developed further.

MOVEMENTO FEATURES:

Powered by MODULA Audio Engine
MOD song player
Background playback
Powersave mode
Playlist
FREEWARE (always nice)

MOVEMENTO REQUIRES:

PalmOS 5.x powered device (SndStream API required)
MCA2 tool by CliePet for Sony Clie NX/NZ/TG series devices
SD/MMC/MemoryStick card

Not all devices MOVEMENTO works on are displayed here!!!