I've made a simple diff of supported OpenGL extensions on NVidia & ATI cards. Lists were done in GPU caps viewer -- 3.2 compability (default) profile. Vendor-specific exts are marked with color background.
The good news: bindable uniforms.
The bad news: no direct state access on ATI. I hope this is going to be implemented soon!
Thx Krajek for ATI extensions. :)
See it here: