The Topeak Micro Rocket series - I can't think of a bike that it wouldn't fit on. Plenty of room between my left crankarm and frame. And if it really won't fit on your frame, it'll go in a jersey pocket or seat pack.

Not the quickest way to air a tire. Not very polite on a group ride unless you make it very clear that you don't want anyone to either wait or lend you their CO2. But it definitely is good for enough pressure that I'm comfortable finishing out a ride.