Any executable file in /home/user/.kde/Autostart is executed automatically when XWindows starts. You can put a shell script there and have it run anything you like. I have it run syndaemon, so my touchpad is inactive while typing, and I also want klipper (the excellent cut and paste utility) and jpilot (better than Palm Desktop, but for Linux) to start every time. I created autostart.sh (any name will do, I just picked that), and it has the following:

# run syndaemon, with a delay of 1 second after a keypress, and have it stay as a daemon
syndaemon -i 1 -d &
klipper &
jpilot &

You can add any commands and any programs you like, just remember to set the permissions to make the script executable.