At Sony’s E3 press conference this afternoon, Sony Computer Entertainment of America president/CEO Jack Tretton touted the ways Sony is ushering in the age of 3D with the PlayStation 3. They’re not messing around when it comes to games — they’re going to integrate 3D support into a lot of existing and upcoming games, but in addition, there will be 20 3D-native PS3 games available by the end of March 2011.