It's a little old, but Xiao Xiao does kick ass. I think that last time I checked there were 6 or 7 of them, some interactive. Check www.newgrounds.com and go to Portal. Most of the stuff there is crap, but occasionally you'll find a sparkler. I'd recommend Karma Ghost as well. Very stylish and a bad ass bassline.
edit: Holy Shit I'm linkified! Way to go for us html retards Zims.
(edited by astrobstrd on 2.3.03 0151) Ph-nglui mgwl'nafh Cthulhu R'lyeh wgah'nagl fhtagn
Spoiler... somewhat. At the end of Jason Goes To Hell, when the Freddy glove comes out of the ground and pulls down the hockey mask, I and my friend Chris squeeledlike little schoolgirls at a NSync concert.