official info about uo is here http://www.uoherald.com/kingdomreborn/ , it is a p2p game, but there are lots of freeshards with the older UO version which has 2000year graphics, there is only one freeshard I've ever found which support new version (Kingdom Reborn) - http://www.kingdomreborn.eu/

I would love some more information about UO, as I have never played it and dont know if its free or anything