Sailor Senshi Page - Possibly the best combo Sailor Moon page that covers both the orginal and the dubbed versions of Sailor Moon.
Hitoshi Doi's Sailor Moon Guide - THE Sailor Moon information page run by Hitoshi Doi. This is absolutely the best place to get just about any information on Sailor Moon in Japan.
Bunny's Tour Through the Silver Millenium - A site with so much Sailor Moon info that you probably won't see anywhere else. Very creative and informative.
Dies Guadii - A site that researches many aspects of the Sailormoon anime and manga. If you were ever confused or curious about aspects of Sailormoon, this place is practically guranteed to have a lot of info.
Juuban District - A web site dedicated to the new live action Sailor Moon series, Pretty Guardian Sailor Moon. Has information on practically every aspect of the show thus far as well as even information on how the live action series compares to the anime and manga. A must-go-to site if you're a fan of the new live action series.
AQ's Worst of the Web - The AQ is a great team who review SM pages and post up the ones to avoid, as well as good ones. Now shut down, but still a great archive of information and such in the six years it was up, also held the people's choice awards, which awarded the best Sailor Moon sites on the internet and was a coveted prize.
Project WikiMoon - This site uses the open source wiki software growing in popularity to reference everything regarding Sailor Moon. Every aspect of the show, its fandom, and more is focused here. Being a wiki, anyone can contribute or edit articles to expand it.
SailorVGame.org - THE site for any Sailormoon game, offical and fan-made. Any game in the Sailormoon universe can be found here, as well as many fan projects.
Sailor Moon Center - Great site to watch and download SM episodes, currently re-subbing the series using the R2 DVDs which look simply amazing.
VKLL - Fansubbers of episodes 73 - 200, the movies, SuperS Specials, and Ami's First Love mini-special, as well as many other anime. Now only offers Stars, Ami's First Love, and SuperS Specials due to commerical releases, however the fansubs here are availble in both VHS as well as DVD format.
Glen Pierce's Fansubs - Another of the big distros, Glen Pierce is probably the biggest I've ever seen. Becoming most famous with how he offered Sailor Moon, as well as being the offical distro of Studio C, who fansubbed the first two seasons of Sailor Moon, he offers one of the biggest lists of fansubs I've ever seen. Like Glass Rose, great prices and great service.
Glass Rose Distribution - One of the biggest Sailor Moon VHS distros, Glass Rose has some of the best prices and service I've seen. (not to mention it's only a couple hour drive from me ^_^)
Family of Moonlight - A web-blog dedicated to focusing on the fanbase of Sailor Moon, showing how strong and dedicated we are today. I have recently started helping out with this site.
Miss Dream - A Sailormoon translation site, the staff here translates musicals, lyrics, doujinshi, and more.
MoonKitty.net - One of the few sites still around longer than SMU, it covers every iteration and version of SM extremely well.