Tim Minchin
Tracie Harris
Stephen Fry
Neil DeGrasse Tyson (probably; he has good reasons for not coming out and I don't blame him for it at all)
Lawrence Krauss, especially after his opener to his Life, The Universe and Nothing: Has Science Buried God? talk with WLC; he usually wouldn't make my list, but after that...
Matt Dillahunty
QualiaSoup
Tracie Harris
Stephen Fry
Neil DeGrasse Tyson (probably; he has good reasons for not coming out and I don't blame him for it at all)
Lawrence Krauss, especially after his opener to his Life, The Universe and Nothing: Has Science Buried God? talk with WLC; he usually wouldn't make my list, but after that...
Matt Dillahunty
QualiaSoup
Teenaged X-Files obsession + Bermuda Triangle episode + Self-led school research project = Atheist.