DriverBackup!
http://sourceforge.net/projects/drvback/
DriverBackup! copies the installed drivers in your Windows system and recreates the INF files needed so that they can be reinstalled in Windows in the future.
DriverMax
http://www.innovative-sol.com/drivermax/
DriverMax extracts the installed drivers in your Windows system and copies them along with the INF files so that they can be reinstalled in the future when needed (such as when you install Windows again). All Microsoft and non-Microsoft drivers can be exported by the software; you can select which driver you wish to copy / backup, or all of them, if you wish.