Cordless Impact Drivers?

[another Todd]

True, and the air impacts are much faster as well. The cordless ones are very similar to the electric ones from say Dewalt, only without the cord (and without the need for 110 volts.)

 

[Quickbeam]

You may want to check out Ingersoll Rand's brand new line of IQV Series tools. Professional quality, powerful, and tested by race teams. The results were equal to pneumatic tools:

http://tinyurl.com/um844

Around $200 for the 1/2" impact gun iirc. Fwiw IR doesn't make junk.