Star Trek is one of the two franchises being compared on this website. There are five live-action series and ten movies in Star Trek; to examine a topic as treated in the whole of the franchise, click one of the topical tabs to your left. To examine a topic as treated in one of the series, click one of the above tabs. ENT is for Star Trek: Enterprise, TOS is for the original Star Trek series, TNG is for Star Trek: The Next Generation, DS9 is for Star Trek: Deep Space Nine, VOY is for Star Trek: Voyager, and the Movies tab discusses things as treated in all ten movies.
has an excellent article on Star Trek.
Ex Astris Scientia
is an excellent Star Trek trivia site.
is another good Star Trek trivia site.
There is also an official website.