Just like my question about CPU specifications - what does this community think would make a useful reference for retrieving GPU specifications quickly and easily? Of course you can go to manufacturer websites to slowly and laboriously retrieve data, but in my experience manufacturers don't always provide all the needed information, at least in one spot, and sometimes they are just hard to find in general (think mobile GPUs).
Once again, my expertise in the x86 space shows its weakness when it comes to mobile; I don't have anything to suggest for the Mali, Videocore, or other mobile GPUs series.