yeah it started a couple of years ago on phoronix.com, i thought at that time thaat it would be a a great opportunity to linux gaming market. maybe linux would get better support for the gfx card (open source or close source drivers). Now it's still confusing if valve intent is for real or not. win 8 seems to be quite hated by Gabe Newell. Now that EA launched origin API for distribution and also Desura came b4 origin are becoming real competitive. the first blob was when l4d had linux *.so files and other stuff, then a steam linux bin was made public, with no press release what so ever. Now they show a video with l4d2 running on ubuntu, but the video isn't of great quality so i could say that it could be running on wine... it's confusing yet i would like to see this happening!