Apples switch to INTEL has initiated heated discussions among developers on where the limit is in terms of cross-OS compatibility. Here are the first visual results:
Windows on Mac
Official Competition Site: http://onmac.net/
Video: http://youtube.com/watch?v=nzH6OFpXgzI
OSX on PC
Dev Community:
http://www.osx86project.org/
Tutorial (ESP): http://www.cristalab.com/tutoriales/116/instalar-mac-os-x-en-un-pc-intel-x86
Tutorial (ENG):
http://www.uneasysilence.com/archive/2005/08/3934/