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
I keep forgetting to mention this, and perhaps by now this isn't news to many people, but I thought it was worth mentioning since I know there are quite a few W soda fans. I was at Subway a couple weeks back and was greeted by one of these beauties.