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As far as a system info program, a task-manager like program is available for kde, just hit "ctrl-esc" - I don't remember what the program name is called, and I'm not in KDE right now. You can also get some good info from the command-line about memory / CPU usage / etc. by running "top".
For the startup programs, you can see what's run on bootup by looking at /etc/rc2.d. All of the scripts in there right now are probably there because of packages you have installed - things like the ssh daemon, cron, etc. The other numbers (besides 2 - e.g. /etc/rc1.d, /etc/rc3.d) mark different runlevels the system enters into, you can find information about the runlevels by typing "man init". Looks like 0 is shutdown, 1 is to get the system into single-user mode (early / emergency initialization), and I BELIEVE 2 is for multi-user startup and 6 is reboot, but I could be wrong. Anyways, placing a link to your own script in one of those folders (and making sure the execute bit is set on the appropriate script / program) will cause that script to be run on entering that runlevel. Make sure you name it like all the other scripts - Sxxscriptname, where "xx' is a number from 00 - 99 that signifies the order the scripts in that folder will be run in, and "scriptname" is whatever name you want.