I blogged earlier today about trying out Apple Boot Camp. The installation succeeded and I have WindowsXP running in full speed.
However, when the Boot Camp partitioner wanted to start the Windows installation, the OSX kernel crashed (with the gray screen) and I had to reboot manually. I think that something went wrong there since the MacOSX partition was no longer usable. I had to completely erase it with Disk Utility from the installation DVD (repairing it wouldn't work) and am now reinstalling MacOSX.
I'll blog later about WindowsXP itself, but I just wanted to warn people already that they have to backup their Mac partition before trying Boot Camp out.