I don't look, and I don't care. I don't look for good guys, I look for bad guys. Besides, unless the person accidentally flashes, you may SUSPECT, but you never KNOW, so what's the point?
What you people really SHOULD be looking at is the guy who makes your hair stand on end or the crowd of people who look like they're out hunting trouble.
I look for those guys too, but I figure why limit myself? If SHTF, and a fellow CCW'er draws beside me, I'd like to think I've already assessed that guy and decided he's on my team.
I simply make it a point to quickly glance over each person I see out in public. A marine on here once had a sig line that read something to the effect of: "Be professional, be polite, but have a plan to kill everyone you meet", and I think that sort of fits what I'm talking about. The person who makes my hair stand up on end gets my attention for sure, but the soccer dad next to him in the check out line deserves a quick look over as well.