Legit101 said:
http://www.guerrillamail.com/
Throw away emails.
Throw away emails? What do you mean by that? I assume it's not a service that helps you delete stuff from your inbox.
Or by throw away emails, do you mean disposable accounts or addresses that you can use to send mail anonymously?
Anyway, here are mine:
http://earthobservatory.nasa.gov
Daily images of the earth, mostly from space. Often has interesting views of current events. Also has links to the Blue Marble earth imagery that everybody uses now whenever they need an earth texture for a space scene. The damn thing should be a trope by now, like the Wilhelm Scream.
http://seamless.usgs.gov/
Another great place for satellite imagery, shaded relief maps, and digital elevation models.
http://www.ted.com/
Most of you probably are familiar with this one, but for those who aren't, a variety of talks by scientists, innovators, entrepreneurs, philanthropists, activists, educators, entertainers, and artists, sharing their ideas on how to make the 21st century a better, brighter, more interesting place, spreading the word about new technologies, or just plain making us laugh or think for 20 minutes at a time. I often listen to these while working.
http://thesciencenetwork.org/
Best known on the internet for their Beyond Belief conferences a few years back. Like TED, but focuses mostly on physics, mathematics, and biology. Kinda hit-and-miss though, depending on what your interests are. Stopped visiting them so much after I found TED.
And cracked, tvtropes, xkcd, penny-arcade, several parts of the Escapist, and bay12games.com, (at least before I discovered minecraft.net), but most of y'all know about those already.