Not really an installable as its a bit of an Alpha release but here is the dev page

http://www.remlab.net/files/vlc/fremantle/

You need to install these files
libvlc5_1.1.0~git5935-1_armel.deb vlc-nox_1.1.0~git5935-1_armel.deb
vlc-player-nox_1.1.0~git5935-1_armel.deb
vlc-player_1.1.0~git5935-1_armel.deb

There all .debs so just download them to the n900. Default is /home/user/MyDocs

Then run You will have to do this in order the lib first then vlc-nox, player-nox, player.

When you have Vlc installed simply run

vlc /path to file

ie
vlc /home/user/MyDocs/test.avi

If you are feeling really adventurous you could try dbus-switchboard that qole is developing to handle certain files by vlc automatically.

All usual warnings apply for using Alpha software. It can/will be buggy and very hard to uninstall.