I just found a nifty trick from Lifehacker which allows you to get a list of all drivers on your computer. It lists available drivers, including installed. It works with Windows XP, 2003 and Vista. Check it out:

Start - Run - Type "cmd" - click Ok - Type "driverquery" without quotes - Press Enter

Tada! You now have a list of all drivers you currently have!

Also, check "driverquery /?" for help. You will find that apparently, it can query drivers installed on remote machines too! Quite cool, isn't it? :D

Go experiment now, kids!