about not being negative when photographing others on the street

Here is a link to a video in which a photographer talks about his experience of street photography and being able to photograph there ... without being negative!

http://spinetv.net/stolenmoments/2010/10/2

He says that one needs to know one is not doing anything wrong or hurting anybody;

There is a discussion about this issue on Flickr at ...

http://www.flickr.com/groups/instruction15/discuss/72157625795529658/