yeah I prefer top. Run it at the command line as:
where "$" is the prompt
This will give you a dynamic list of processes. If you want to kill one, hit "k" and then type in the process id.
You can also get a list of processes using the "ps" command. A useful way to use it is:
$ ps -ef
If you know the command you're looking for you can "grep" for it, such as:
$ ps -ef | grep bad_command
Alternatively you can use the command "killall" to kill all processes that were started will a command such as
$ killall bad_command
Hope this helps.