So it has been a year since i did any significant system/OS maintenance on my Macbook 2.2ghz santa rosa. Everything seems to be working great, i went from 2gb ram to 4gb for christmas, and everything seems to be fine. But i would like to make sure i am at peak performance... i did a little digging and i discovered a program called OnyX which is a utility for system/OS cleanup and overall maintenance. I'm posting this so that i can ask for advice on how to use it, i dont know which options are safe, what caches to delete etc... I just want to make sure my mac is optimized and running well. No problems yet, but i thought it might be time, as it's been over a year since i did anything but use it. Also.... should i defrag my mac? I have been told macs defrag themselves, and i've also been told defragging improves performance in spite of those claims. thanks yall!