People noticing you can be a good gateway into a terrific conversation and/or photo. When I first started shooting at a newspaper, it was hard to approach people cold, but a lot easier quicker than I thought...mostly because I've grown to realize photographing someone is like having a conversation with them. I've always held that, anyway.

How you handle a situation is what really determines it - you're not doing anything wrong by photographing (homeland security lunacy, be damned) and I've found that simply being honest, and putting forward your belief and passion for what you do always wins people over.