Thanks everyone. I will give Prey a try but am considering going with Hidden.
BUT...as one of the replyers astutely said - if I were to steal a laptop I would be smart enough to wipe the drive right away before using it. But I'm guessing at least 75% of thieves aren't that knowledgeable, particularly on Macs. A look at craigslist reveals a number of likely stolen laptops for sale, so there's probably a decent chance I'd wind up, at best, nabbing the unknowing buyer of the macbook instead of the actual culprit.
I work often long stretches at coffee shops/cafes like Starbucks. A man's gotta pee sometimes : ) With my typical work laptop (an HP Elitebook that is very nice as far as Windows laptops go) I just leave it on my table/seat for a minute while I do my business. Been doing that for a couple of years now. But with the cost of this MBP (out of my own pocket), I'm a little more leery. I am going to look into a physical antitheft device of some sort instead.
AHHHH....just thought of something - is there an app that will leverage the movement sensors in the laptop so that, when I gotta leave it for a few minutes, I can just press a button and then if the laptop gets moved you have 10 seconds to hit a certain key combo or the alarm goes off? Hmmmm...if that doesn't exist it might be my first crack at developing a Mac app : )