NVIDIA - ATI equivalents table

I was wondering if it's possible to setup a table which lists all GPUs from NVIDIA and ATI (and perhaps Voodoo lol) side-by-side. The point is to provide information which will immediately answer questions like "What's the ATI equivalent of the GTX 260?". The cards can be bunched together based on their performance level I think.

I know you TH guys have done a great job with the graphics card charts, but it's still a bit hard to immediately find out which GPUs from one brand are somewhat equivalent to certain GPUs of another brand.

I was just about to point that out lol.