Windows 7, and Vista have a cool feature. Press shift while right clicking on any folder, and some new menu options are shown:

One of them allows you to open a command prompt that is rooted right in that folder. This is a convenient option, since you don’t have to launch a command line, and then work your way back to that folder.
Unfortunately it does not exist in 2000, 2003, or XP – But I found an easy way to add it.
Create a new file on your desktop and call it “Command.reg”. Right click on it and edit it with notepad.
Add the following lines:
REGEDIT4
[HKEY_CLASSES_ROOT\Directory\shell\cmd]
@="Open Command Line Here"
[HKEY_CLASSES_ROOT\Directory\shell\cmd\command]
@="cmd /k \"cd %L\""
Save it, and then double click on it to add it to the registry. When it asks you to confirm.

Just say yes.
And now, when you right click on a folder in XP/2000/2003 (No shift needed) you get the same option:

