I tried this nice tool to convert some movies to rmvb format and they work great. You can find the details here:

http://forum.doom9.org/showthread.ph...8&page=1&pp=20

Not sure if it supports direct rip of DVD's but it definitely supports a lot of video format.

It can also convert some non-Nokia 770 playable rmvb files to playable ones.

Anyways, enjoy.