OS X will not boot in most virtual machines. I'm not sure if this is an issue with the bootloader, so far the only success I've had in booting an OS X VM is in VMware (which works extremely slowly, and with barely any hardware support).

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• Gigabyte GA-P35-DS3P | Intel Core 2 Quad Q6600 @ 2.4GHz | BFG GeForce GTX 260 (216 Core) | 2GB | 250GB + 40GB + 250GB HDDs | Mac OS X 10.6.1 | vanilla (Retail install)| Everything working
• MacBook Pro (Late 2008) | GeForce 9400M + 9600MGT 256MB | 2GB | 250GB HDD | 10.6.1