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Links:
It's pretty hard to find great Oh! My Goddess websites. Most of them are inactive, and are rather lacking in content. Here are a few I found that are still active:

Megami-sama.net - This website has it all. Tons of information on the anime, and the latest news.
Visions of Goddess - Tons of images from magazines, merchandise, etc.
Working Girl - A shrine to a secondary character in the anime, the demon Mara.