Thanks to Op for the video. I've ran the instructions in the other thread and the video now loads up on booting, but Im getting what feels like odd behaviour. I wanted to run it past everyone to make sure it's ok.

When i start up the phone now I get the white "Nokia" screen, then the flashing white loading dots. The dots disappear and it goes all black for a few seconds. Then I get the flashing loading dots again, then the new boot video from this thread. I don't remember this stutter before. It also seems slower to put the widgets on the screen now after booting up. Im not sure if this is all in my head, anyone else notice similar behaviour?

I followed these instructions, I changed the name of the avi file to match.

sudo gainroot
mv /home/user/MyDocs/.documents/default.conf /etc/hildon-welcome.d/
mv /home/user/MyDocs/.documents/maemo.avi /opt/
cd /usr/share/hildon-welcome/media/
ln -s /opt/maemo.avi maemo.avi