You will find it here
It is a free download for those who purchased iLife 08 and, I guess 09
You may have to copy and paste the link into your browser, let me know if it does not work
We upgraded out iLife to 9 but we didn't load the iMovie 9 as we do not have a dual processor on the iBook G4 we are currently using. Went to use the iMovie 5.0.2 today to upload some video and it is only showing pink and green colors, everything is pink and green. Anyone have any thoughts on this one?