I was using this software happily until one day, out of nowhere, I get a kernel panic (PowerBook 1.25/1gb RAM). No big deal right?, almost everyone gets one at some point...
However, after restarting, I get another, and then more and more. I was able to narrow it down to SideTrack. When I attempted a kextunload on the kernel extension, I would get more kernel panics! I did a "Safe Boot" and deleted this software, and everything has been working perfectly ever since (it's been a week).
Anyone who is serious with his iBook/PowerBook should *not* use this utility, I'm dead serious, at least until this stuff gets fixed (I will NEVER trust a version 1 release on a kernel extension ever again, these things need extremely careful testing - and this was obviously neglected).