rockplayer has been able to play every filetype i have thrown at it.
This has been a pet peeve of mine since leaving my BBstorm with Berrybuzz which was the best app i ever used.
blink, missed call. gmail...
Launcher Pro, Light Flow, GroupMe, Skype, SABcontrol, FBreader and PowerWidget
Rockplayer (best app)
This probably has to do with a known issue, i found this on the motorola site...
Separate names with a comma.