People watching is fun !
No honestly it is, Im not confident enough to stick my camera in peoples faces yet i find some of the street reportage style work posted on flickr great.
I have a limited number of shots that i have taken while people watching but i seem to miss the "decisive moment" as it were and think to myself wow that would of made a great picture, I guess its all in the timing and the ability to predict the event and my timing is still a little off.
I am working on it though so i expect there will be a few more pictures in my portfolio of street scenes if i can get my timing right.
Anyway here is a link to Stephen Wright's flickr stream who does manage to get the timing right and he has a great ability to predict the picture before it happens.