Many of these programs will be detected by virus scanners and some may just delete them as soon as they are seen, so I recommend disabling your virus scanning temporarily while you use these utlilites.
Mail Pass View
This useful little program will get the passwords out of outlook, Windows Live Mail and some other commonly used mail clients. This does need to be ran with administrator privileges.
IE Pass View
IE Pass View will get cached passwords and usernames out of internet explorer.
Firefox Pass View
Same as IE Passview but for firfox.
Wireless Pass View
This gets your wifi password. It can only get the ones for networks that have the passwords saved on the computer.
This gets the password for an encripted outlook pst file.
Windows Password Recovery
**I prefer to just delete the password and reset it because it is quicker and easier than waiting for it to crack a password.
Offline NT Password Registry Editor
This bootable CD lets you either edit the registry or delete the password
This utility will bypass the logon screen of windows and not delete the password. From there you can change another users password or create another user or do whatever it is that you need to.