There's also a site that has a load of legal divxes (adverts, shorts, etc.) encoded for, well, moviepark, but they look fine on GPCinema too... Can't remember the addy though.
www.gp32-divx.com is where all the edonkey links to pre-encoded GPCinema .avi's were but it seems to have dissolved. Wouldn't see any reason why they still wouldn't be on eDonkey