Mandrake 9.1 is an excellent distro with a lot of hardware support.
3) There are so many Aqua themes for various window managers and programs like GKrellm and media playing apps that it almost hurts!
I made one too, for Fluxbox.
(Problems with the Freshmeat upload atm though
4) You can use the terminal/console command to list the processes and then kill them, or send various signals. Man top, ps and kill.