Flash videos converted for Zaurus aka YouTube video rips
Youtube google vid and gobs of other sites
On your desktop machine
1-first get the Firefox plugin VideoDownloader
http://javimoya.com/blog/youtube_en.php
2-Visit YouTube and find a video to rip
3-the plugin will dump out a file which you need change the name to add a .flv extension
4-then get ffmpeg which is in the extended ubuntu sources
5-run it like this in console:
ffmpeg -i video.flv -ab 56 -ar 22050 -b 500 -s 320x240 test.mpg
man ffmpeg will let you know about all the options
6-now just FTP the new mpg file over to your Z and media player can play it