Canon's got a bajillion cameras laying around, but this little guy, the Power SD780, is the one that most of the Canon reps said they want to stick in their pants and take home.
That's because it's really teeny and the easiest to stick in your pants, and it pulls off the square form factor really nicely without being boring. I don't think it's quite as comfortable to hold as its slightly larger, more ergonomic-minded older brothers because it just borders on being crampy to use, but this will fit in your jeans pocket better than any other Canon camera (Sony's typically been the master of truly pocketable point-and-shoots), and it shoots 720p video.
Unfortunately, it's still using Canon's old UI—a couple of the newer models have a slicker, more list-oriented menu style (more on that later)—but at least the button-layout is relatively straightforward. Oh yeah, the form factor really is the reason to buy this thing. Why? Every one of Canon's new 12-megapixel cameras uses the same image sensor, and this only has a 3x zoom (the step up models have a 5x zoom lens).