Hmm, I'm familiar with the JAG fandom but I don't believe that I know of any community like this board is for LnC. Then again, JAG probably doesn't have a community this cultivated - instead most of the interaction can be found in several yahoo-groups (which work like mailing lists) or primitive bulletin boards.

If you're simply looking for a website with a selection of the best stories, try the Legacies Archive .