Looking for a game programming/physics site

I once knew of a great site for simple tutorials, with both theory and programming information. The site had a sidebar that had difference "physics" categories, such as particle engines and springs and strings and waves and random numbers and collision detection and such and such. The site had nice diagrams and long tutorials. The site seemed to be affiliated with some sort of a graphics development or viewing software.. and I can''t remember that either. It had a few links to this new video viewer or something like that. Anyways, it was a game physics site. Anyone remember it? And no, no google luck. Thanks for any help.