e-wallpapers
http://e-wallpapers.info/

Finally a site with REALLY good wallpapers, most if not all made by deviantart members.
These wallpapers are flawless, and neatly categorized for easier finding.
If you're tired of your old wallpaper, please go there; you are guaranteed to be satisfied.

Every Episode of Futurama
http://allfutus.com/index.php?season=1

Every free episode of Futurama season 1-5 can be found there. Those of you who browse digg probably already know that, but for others - have fun watching!

Astronomy Picture Of The Day
http://antwrp.gsfc.nasa.gov/apod/astropix.html

Nasa's website which updates every day adding a different picture associated with astronomy.
Today's picture is the infamous 'Face on Mars' or 'Cydonia Face' pictured really close-up.
(Here's the 3721px * 2480px version of it). In case you'd like to compare it, here's the original 1976 picture of the 'Face on Mars'

Project Gutenberg
http://www.gutenberg.org/wiki/Main_Page

If you've ever wanted to read free books online, here's your Nirvana.
Contains over 19,000 free downloadable ebooks

Radio Locator
http://www.radio-locator.com/

This is the radio station search engine with over 10,000 radio station web pages.
Can search by location, genre etc.

The longest list of longest stuff
http://thelongestlistofthelongeststuffatthelongestdomainnameatlonglast.com/

Like the title says. Cool page about everything that is long(est). Offers fun facts (longest word (unofficialy) is 'pneumonoultramicroscopicsilicovolcanoconiosis' which means 'lung disease').

Ted the Caver

This site is way old but also way cool. It tells the story of caver Ted in form of a diary. Ted and his mate find a new unexplored cave hidden behind a small hole. Next day they return to cave with tools to make the hole big enough to crawl through and see what's on the other side. Here's when the things get creepy.

A must-read for any horror story fan. Eerie feeling was all over me from the beginning to the end.

Make sure you take ~2 hours off, it's a long read. (but well worth it)

http://www.holyshiite.com/caver/

First site submitted. This is one of them "draw a sketch" sites, but with one exception. There's only 1 picture made every week and each visitor can make only one line consisting of 100px per visit.

He/she can then vote on other lines made by other people (Voting is done by changing the opacity).

http://www.swarmsketch.com/