I've just spent the last ~1.5 days fixing my PC after a sketchy installation of OSX86. It completely botched my bootloaders for XP, Vista, and Linux, and destroyed the Vista partition itself. Luckily I don't use Vista at all, or this could've been messy.
Anyways, my tip for the day is this:
If you don't have several Live CDs of Linux and Windows, and you don't know how to manually install a bootloader, don't attempt to install OSX86.
That's all :)