I've been obsessed with Homestarrunner lately...

Main site: www.Homestarrunner.com, watch the intro

My favorite "main page" themes:
Heaven, hover over "e-mails"
News, hover over "downloads"
4th of July
8-bit, hover over "e-mails"
The Cheat, hover over "downloads" and "e-mails" (more than once)
Winter, hover over "characters"
Hacker, hover over "downloads"
And of course, Homsar