I carry a spare tube and a patch kit. The spare goes in on the road and the punctured tube gets patched when I get home. The patch kit is there for any subsequent flats. I'm always very persistant in trying to find the source of the leak if it's still in the tire. For inflating, I carry both CO2 and a mini pump. You can't beat CO2 for speed and it's really nice to use in weather like we're having now. The mini pump takes care of flats after I run out of cartridges. The other things I carry are a Crank Bros. multi-tool and a few zip ties. One tip on patches: Rivendell carries my favorite tube patches. They are made by Velox and are slightly smaller than a dime. They are perfect for thorn holes and other round punctures. I also carry a few larger ones, but use more of the Veloxs than any other size. Slime tubes usually work on round punctures but are not effective against snakebite flats. They are also more difficult to patch because you must get all the Slime off for the patch to stick. You also pay a weight penalty with Slime. I like them in my mtb tires.

Smokey

Lemond Poprad, Fisher HT mtb, Burley tandem