Links
Linux
Linux.org An excellent resource for information on Linux, includes apps to download and information on current Distros
Distrowatch Information and links for an unfeasably wide selection of Linux distros, Probably the best place to go if you are looking for info and the latest developments.
Lugs, not a website as such, Linux User Groups are incredibly useful resource if you are just thinking about experimenting with linux, google for your local one, there should be one close by
Justlinux a website dedicated to helping new linux users. Tutorials, forums, news. Incredibly useful at times.
Google The ubiquitous search engine, and many tentacled god of the internet, has a linux specific search engine, use it, it is the best place to find that fix that has been niggling you, or how to set up your modem/scanner/printer up in whatever distro you are using.
Gnu.org The Homepage of the Free Software Foundation, information on a wide variety of topics, from software to the philosophy behind the Open Source movement.