I love that site! The only part i've spent alot of time on are the strongbad e-mails, they crack me up! My favorites are the Anime, and the one where he draws the dragon with one buff arm (burninator?), and really anything where he sings (or raps)!
EDIT: If you liked teen girl squad you might like some of the stuff by Don Hertzfeldt. You can look at some of his art on
http://www.bitterfilms.com/ for more info about him (click on the cat for some cool stuff, and be sure to check out his old comic strips), most who know him, know him from Rejected, but he's done quite a few other one's that are hillarious. You can't watch the video's from the website but you can find them else where, or better yet go see
The animation show in thearters, they show rejected, billy's balloon, as well as three new shorts, along with some great animation from other artist, some are boring but I was laughing my ass off through alot of it, and some are just sweet.