I use Force Quit as well, but as I said some tasks won't die. That's when I use the command line to do them in. The Activity Monitor is a utility that I never use. However, the fact that you use it to kill those pesky immortal tasks is an example of a very nice MacOS X feature. There is often more than one way to get things done. It is also an example of the fact that you do not need to know everything about the OS to be productive.