Never never do a `kill -9 1`. Also avoid doing a kill on certain processes like mount`. When I have to kill a lot of processes (say for example an X session gets hung and I have to kill all the processes of a certain user), I reverse the order of the processes. For example:

 ps -ef|remove all processes not matching a certain criteria| awk '{print $2}'|ruby -e '$A=stdin.readlines; A.reverse.each{|a| puts "kill -9 #{a}"}'|bash

Keep in mind that `kill` does not stop a process and release its resources.
All it does is send a SIGKILL signal to the process; you could wind up with a process that's hung.