As well as snapping with big expensive cameras, it's nice to remember the adage that the best camera is the one you have with you.
I've sneaked and snapped a few people and places just using the iPhone camera over a couple of years. The majority of these are over here at a little free wordpress site I keep for such things.
With apologies to those who might not agree with the candid nature of these, here's a few to remind you that regardless, bigger isn't always better. These are all taken and edited in-phone.