I love the hardware store.
Out at Lowes last night, I noticed that their Kobalt line of tools are now designed to run off of a miniature tank of compressed CO2. They have 2 sizes of refillable, replacement tanks, 11 and 22 oz each (I think).
I don't know what connector it comes with (it was sealed on the packaging) but I bet someone could rig a system for kegged beer.
You can also purchase a mini regulator to go with these tanks, complete with hoses, etc.
I couldn't find the replacement tanks online, presumably because they won't ship the canisters, but click here
to see the tank and regulator setup...
I haven't yet started kegging my beer, so I don't know what might be involved with this, but does this seem like a great idea to anyone else?