My random notes about the stuff I've done
Playing audio on n800 on ARM side gets easily interrupted when doing other tasks at the same time. With Maemo nicer you can give your application any nice value. Running audio player with near maximum priority removes most of the annoying hickups, not all though. This works nicely for processes requiring certain constant amount of cpu time (like decoding real-time audio), but for processes taking all the cpu they can take, this is probably a bad idea.
NOTE! Maemo nicer installs a suid root binary for renicing any process.
Click here for single click install.