I read about Viacom's going after Trek fan sites in the paper, but from within Trek fandom, I have to say I haven't noticed it at all. Tons of Trek sites are still up and running. Some of them even get interviews with the Trek actors and writers. Others are small personal pages, devoted to particular characters, pairings, or situations. (Pon farr stories, anyone?)

The handful of sites the lawyers came down on were those they considered unflattering to Trek - parody sites and the like. (Which is ironic, because those are the most likely to be considered protected speech.) They don't even go after Star Trek in Sound and Vision, a huge multimedia site. Which makes them more generous than many. A lot of copyright holders allow fan pages, but do not allow video or sound clips. At least not large archives of them.