After getting two flats in a row last month, I finally broke down and bought a CO2 system. Using a mini pump on a 35cc tire isn't too bad, but the 29 x 2.25 was horrible. Never could get it to full pressure. Now that I've got (and carry) the CO2 I'll probably never get a flat again!
Andy has a nifty mini pump that also does co2. It's on our wish list