Something I've found I really like to photograph is people I don't know doing whatever it is they happen to be doing, like this or this. I find it a bit awkward, though, to just point a camera at someone... I usually find ways to be a bit sneaky about it (which maybe I enjoy), and take the picture as fast as I can, but I'm sure this affects my shots' quality. I sometimes see great pictures of people in their environments and wonder how the photographer got it... Did he or she ask or just take the picture? Have a huge zoom? What are your techniques for taking pictures of people you don't know?