Here are a few good websites:
www.slashdot.org: Slashdot is a great resourse for science / technology news, and also a great time waster!
www.gentoo.org: Gentoo is an awesome distribution of Linux and my personal favorite. It's most likely not a good distro for beginners, but for experienced Linux users it gives great control over your system.
www.mandrakelinux.com: Mandrake is also a nice distribution of Linux. If you are interested in Linux (and you should be) this is a great starting point.
www.gnu.org: The GNU homepage.
www.eff.org: The Electronic Frontier Foundation (EFF) homepage. Become a member today!