Ultima Online Homepage:    Official website for  Ultima Online, great forum  and new player support
Ultima Stratics:                 A great resource site  for skills,  events, updates.. maps.... its got everything!
Player vs Player: Not an ultima site, but its a great daily online comic. Check out the archives! :)
Chesapeake Events Team A site for roleplaying events on the Chesapeake shard.
Starwars Galaxies:     Its not Ultima, but its a great up and coming title with a great crafting/designing  system.  Im starting a wookie mining colony there (no joke).