I had been practicing portraits on people I knew and thought that portraits of strangers should be fun. It was definitely harder than I had expected. I had asked a number of people their "secret". Some people asked before shooting, some people people fooled people into thinking that they were shooting something else, others were stealthy. I felt a bit "dirty" taking pictures of people sneakily. On the other hand, I didn't have the guts to go up to people and ask if I could take their picture. Some of the photos turned out OK, but it was a lot of work.
I am still not sure what my ethical position on photographing strangers is. Personally, I don't mind if people take my picture without asking. On the other hand I'm a weirdo. I've read a number of articles an essays about this topic and I still don't have a very good sense of whether it is cool or not to do it. I definitely think it's OK if you ask. My question is whether it is cool to shoot photos of people and post them to Flickr or our blog if they didn't give you permission. As far as I know, in most countries it's legal to do this.