Per-Pixel Lighting and Shadowing

Ok, so we had quite a few topics involving one or the other thing, but nothing definite. I wonder if someone has taken on the challenge of implementing these features - especially for shapes and interiors.

There's a good resource for what I mean:

www.ronfrazier.net/apparition/research/advanced_per_pixel_lighting.html


I'm aware that quite a few people have got bump mapping to work, so it can't be that much of a problem to go one step further.