Jeremy Freeman wrote a review of Serfas Air Pod CO2 Pump on August 23, 2010
I don't have a single complaint with this pump. It's very lightweight, has a trigger for controlled inflation, supports 12g threaded/non-threaded cartridges, and 16g threaded cartridges. It has openings for Shraeder and Presta, and will inflate your tire in seconds.
Of the 10 or so cartridges I've used in this pump, I've never experienced any air leakage like another reviewer mentioned. The pump and cartridges are worth every penny for me... less hassle pumping up your tire and more time riding.
I use the Serfas CO2 16gram cartridges and I get about 40psi with my 26" MTB tires, so make sure you have a couple cartridges with you.