Auto Hot Key

Auto Hot Key is a free, open-source utility for Windows. With it, you can automate almost anything by sending keystrokes and mouse clicks. You can write a mouse or keyboard macro by hand or use the macro recorder. Create hotkeys for keyboard, joystick, and mouse. Virtually any key, button, or combination can become a hotkey.  More complex features allow a user to respond to signals from hand-held remote controls via the WinLIRC client script, run existing AutoIt v2 scripts, and convert any script into an EXE file that can be run on computers that don't have Auto Hot Key installed.

http://www.autohotkey.com/

Task Killer

From the taskbar you can quickly terminate applications, processes, services, etc. You may kill a frozen application, process or service by clicking on the Taskbar Task Killer icon and choosing the process from the menu list. You will forget clumsy key combination Ctrl-Alt-Del forever.

http://www.rsdsoft.com/task_killer/index.php4