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 need some help with this problem.... Two things to get you started: (1) Choose your coordinates for the different cities. It will be enough to assume the Earth is flat, so you can use an XY-plane. (2)