Official Star Trek Sites are the ones that are hosted by Paramount or licensed parties thereof.

Star Trek: Continuum [found] [FRAMED]
OFFICIAL Star Trek on-line area, now COMPLETELY redesigned, and free. Lots of information, including all the episode summaries.

Star Trek: The Experience
the official website of the coming Vegas attraction between Vegas Hilton and Paramount entertainment... Open January 4th! (see Nexus news and LV Sun's article)

Star Trek: The Exhibition of Canada [found]
A top pick! Great graphics and atmosphere, lots of content. The only thing I find wrong is the buttons are hard to find. Check it out, especially if you're in Canada!

The OFFICIAL Star Trek: First Contact Website [found]
OFFICIAL Star Trek: First Contact presence on the web, not too bad, a little thin on content and more on buzz, but good for a promo site.

Simon & Schuster's startrekbooks.com

UPN44 Universe Star Trek Trivia Contest [A28-JUN-97]
Play Starfleet44, an interactive contest that allows you to qualify for prize drawings by testing your knowledge of Star Trek trivia. Each time you answer a new set of questions, you'll have the opportunity to win bigger and better prizes. UPN44 is the San Francisco/Bay Area home of Star Trek Voyager; Deep Space Nine; and Next Generation.

OMSI Magazine's Star Trek: Federation Science [V18-FEB-97]
--the roaming science/Trek show...