Tire Inflation
Cycle Pump, from 
is certainly not the cheapest tire pump out there, but many people seem to feel that it's worth the money, especially if you need a tire pump frequently.
also makes a high dollar 12 volt tire pump.
Here's are a couple of brief Review &
Deryle Mehrten has written a Review of various sizes of CO² cartridges and how he modified an inexpensive air pump from Wal~Mart. If you elect to use one of these inexpensive air pumps, you should not run it more than about 5 minutes at a time, then let it cool for 20 minutes or so. Also, include a couple of long tywraps in your kit. These can be looped around the pump and a foot peg, or other item on the bike to keep the pump out of the dirt.
Fritz Curtis also has bought a small compressor 
from Wal~Mart and removed the case.
has a small imported compressor for under $10.
Here is an interesting VIDEO showing a way NOT to inflate a tire.