These are the pages I read almost every day, these sites cover the most about Uo.

Grand Atlas of Britannia - Maps of Britannia among other things.

Crossroads of Britannia - News source.

The (U)ltima (o)nline (s)statisics (s)ite - Interesting reading.

Uo Online - Origins Uo page.

UO Vault--Ultima Online Information Site - News source.

Gram's Ultima Online Page - A former players page, who recently took a break from the game, still many nice features.

Ultima at Scorched.com - News source.