Here are a number of SF-related websites that I would recommend:
The Rings of Saturn
My other science fiction website.
Science Fiction Weekly A wonderful on-line magazine that covers both literary SF and films. The forum of letters from readers is usually interesting. Pardon me for bragging, but they listed The Interplanetary Railroad, as a Site of the Week.
The Science Fiction & Fantasy Forum at TrekBBS.com
OSC: Mythopoeic Fiction
A singles' website for Latter-day Saints, run by my sister and her husband. If you are unmarried and Mormon, check it out.
A Guide to Flame Warriors
Dark Horizons-Film News and Rumours
The Survivor Home Page
The Church of Jesus Christ of Latter-Day Saints