LiveJournal.com: home of my most-used online journal.
GreatestJournal.com: home of my pop-culture related journal. More than half the people over here are online RPers, though, the other half has friends-locked journals. You'd better be interesting.
Xanga. Mostly overrun with incoherent screeching high schoolers. God help us all.

Snarkfest
TWoP Forums
Fan Forum

Degrassi Boards
Lost Forum
Lost Media. News, pictures, info, everything. They rule, frankly.
Fandom Wank. Wherein the various throw-downs in fandom are mocked.

I Heart Jake. Jake Gyllenhaal site. Yum yum yum.
Josh Holloway.com. because I'm deeply in like lust with the actor who plays Sawyer on Lost.
Brilliance.nu: Jude Law fan site.
Topher Grace Fan

Degrassi.tv. The official Degrassi: The Next Generation site.
Snopes. Urban myth confirmation. This site has debunked some of the stories I have heard from people over the years, including (but not limited to) the "rat pee on soda cans" story and the "Tommy Hilfiger is a racist" story. Half of my childhood/young teenage years was comprised of LIES!
Maroon 5. One of my favorite bands. They need to come out with a new album like, now.
Franz Ferdinand. they're Scottish. They sing songs that make hipsters dance. Of course I like them.
Duran Duran. New Wave rocks and you know it.

Fanfiction.net. Yes, it is occasionally a cesspool of bad fic. But there ARE some gems here.
I Used to Believe. I have pimped this site more than I should. But it's HILARIOUS. Check the "language: swearing" section for one of my beliefs (hint: I mention the movie A Christmas Story and it's high-ranked!).
Elouai Candybar Doll Maker. ADVANCED WARNING: this site is pure, unadulterated CRACK. You can't make one doll and be done. You get addicted. I do, however, wish that brown-skinned dolls were availible. And, oh my God, a boy doll maker!
Generation Terrorists. One of my favorite quote sites.
Best Week Ever blog. Because it's neccesary to keep up with your pop culture news!
Greg's Upcoming Movies. I remember when it was upcomingmovies.com, and now it's affliated with Yahoo. Good for checking to make sure someone's not mangling one of your favorite old moves.
Liquid Generation. Fun fun fun! Play the "movie poster game" and "Would You Rather?".
Da Font. I get most of my good stuff from them.
NaNoWriMo. Short for National Novel Writing Month. During November, your mission is to write a 50,000 word novel. Will you succeed? Will you go insane? Either way, it's a hell of a time.
Wikipedia. Not for use for academic purposes, but good if you want to brush up on miscellaneous things.
Make a snowflake. Another highly addicting site.