There's a new fan-site in town, and it's called http://ultimacodex.com/]The Ultima Codex.
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It's a collaboration between several members of the Ultima and Ultima Online fan communities, and hopes to become the foremost place for all Ultima fans to visit and share in both the history of the series and all the fan-games, mods and community works that are produced.

It's still in it's early stages, but a lot of content is being moved and prepared. Currently, there's a big retrospective of Ultima Underworld for it's 20th birthday. Why not drop by, see what you think and maybe register for the forums.

http://ultimacodex.com/