Visit a good sci-fi site. Lots of TV sci-fi lists, games, competitions with prizes, fun stuff.
Check out a great 3-D Sci-Fi art site. Espen Paulsen is a modern-day Viking with a taste for all things sci-fi. Besides his original art, there are lots of special features, and a very extensive links section.
Check out a great Star Wars site, also here on geocities. It has great games, sounds and images, too.
Nicadaemus' site is also listed in my horror links for his Brom, Kindred, and Bradstreet, but I have to also mention his Star Trek gaming, so here he is in Sci-Fi, too. His gallery is still growing--Go Boldly and Explore.
Slawek Wojtowicz is an artist with galleries of his own original art, but also has links to 700 artists and galleries on the web--all Sci-Fi and Horror.
(In 2 years, I haven't been able to visit them all.