I saw this linked at the Linux Game tome earlier. They seem to have gained over 1,000 signatures today, alone. Almost 5,200 now. The petition might not be structured exactly the way I would have liked it, but the the main points are all there. So, I signed it.
ATI might notice if the petition starts to garner upwards of 20,000 signatures. I'd like to see this happen, and your post here will help. A _bunch_ of people visit this forum. The reality however, is that the vid card business is old school cut-throat. Trade secrets are the name of the game. Plus - open specs would mean drivers devoid of "enhancements" put in by the manufacturers to inflate favorable results when bench-marked. =)
As is, I will never again purchase a mobile ATI product - until they modify their position on supporting them under linux. From the looks of this forum, and many others, there are plenty of people who will be carefully checking which chipset is in their next purchase. If a manufacturer of modems, vid cards, sound cards, etc. does not want to play nice - don't give them your money. Then tell them you didn't give them your money and why. Buying their stuff, then complaining? Worthless. They have your cash, which is the only thing they wanted in the first place.