Heh, at the time I posted I hadn't seen that the exact same site was actually linked in the article itself. Having now read the article I have to say this is a great idea for a site and I'll be following it with some interest.

Also you should do Sonic next. ;-)

http://info.sonicretro.org/SPG:Solid_Tiles#Slopes_And_Curves

http://info.sonicretro.org/SPG:Rolling