While the plethora of tech companies might make some entrepreneurs fear that the field is closed to them, Steve Ballmer says the field is still wide open. In an entrepreneur thought leader lecture given at Stanford University earlier this year, the Microsoft CEO said the dynamic nature of tech means the players are always changing – and there are a lot of areas, such as human-computer interaction, that haven’t been tapped.

http://ecorner.stanford.edu/swf/player-ec.swf