This may allready be known by some but i only found out about it today so thought i would share it. Iv`e tested it on 7 and XP so it should work on Vista.
Basically if use the cmd prompt a lot in a session then if you hit F7 a list of all the actions taken comes up. You then can use the up and down arrows to find the right command (say a directory change), then hit Enter.
Nothing special but may be of use to some