The World of Urusei Yatsura's Lum - This massive website features information on the manga and anime, Rumiko Takahashi, and showcases a large gallery.
Urusei Yatsura Brazilian Shrine (Portuguese) - A series overview site from fans in Brazil.
Project ILM: Industrial Lum & Manga - A site featuring translations and scans of later manga chapters.
The Secret of Urusei Yatsura - An interesting collection of deleted scenes, information on the old Urusei Yatsura Fanclub, and other songs performed by UY musicians.
Urusei Yatsura France (French) - A look at Urusei Yatsura from the perspective of French fans. Includes character guide, anime and manga information and manga scans translated to French.

Character Shrines

Chipster's Sakura Page- The long-running shrine to Tomobiki's resident nurse/priestess.
The Bodyguard's Maximum Cadre Society Okawa Branch (Japanese) - Dedicated to Lum and featuring fan art and product scans.
To Mendou with Love - The one and only shrine dedicated to everyone's favorite rich kid.
Darling! - A shrine to Ataru Moroboshi and the various people in his life.
Tomobiki Shrine - A funny site featuring an "Ask Cherry" section.

Webrings

The Urusei Yatsura Webring- A general Urusei Yatsura webring.
The Lum-chan Webring - An anime related webring dedicated to Lum.
The Many Lovers of Lum - Another webring honoring Lum.

Miscellaneous

Shonen Sunday Museum- An interesting site set up by Shonen Sunday displaying an old Urusei Yatsura story with it's original color tinted pages.
Sak's Urusei Yatsura Fanfiction Archive- A longtime supporter of this site from way back when. This site used to be a part of Tomobiki-cho before Sak took it over and it's grown into something far greater than the original. If you're looking for fanfics, this is the place to go.
Uhu's Anime Zone- A site featuring downloads of Winamp skins, wallpapers, and various Windows media.
Urusei Yatsura - A small site consisting of movie and episode summaries and features interesting facts about various episodes.
Tomobiki High School - Featuring current news from Japan and across the internet regarding the series.
The Lum Underworld - Showcasing character information, images and a forum.
Urusei Yatsura Museum - A unique site highlighting Urusei Yatsura products of yesteryear.
Anime Lyrics: Urusei Yatsura - Has translated lyrics of many Urusei Yatsura songs.
The Urusei Yatsura Calendar Project - A site dedicated to making Urusei Yatsura internet calendars. Featuring calendars dating back to 2000.
Megane's Links - An excellent collection of Urusei Yatsura links from all over the world.
Urusei Yatsura: Rocks the World! - News on Urusei Yatsura release dates in the US and Japan.
Urusei Yatsura: Those Obnoxious Aliens - A U.K. fan site with cels, fan art and the webmaster's own replica of Benten's air bike.