No I have never used OSX86 but I can see it works fine on CERTAIN HARDWARE, I also know that it isn't as simple as just burning an ISO and bunging into any PC hardware and off you go. Handpicked hardware like Anees used maybe, although you miss out on goodies like the multi-touch trackpad, backlit keyboard, display port, 8.0211n, gigabit ethernet etc.
Like Kazi mentioned, it does take some effort and doesn't always work.
I suspect that with Snow Leopard and the OpenCL implementation OSX86 will have some serious issues since I suspect Apple will tailor the Open CL to their own graphics cards to some extent and this MAY render PC's with different graphics processors unable to utilise Open CL.
Open CL is the new open standard driven by Apple alongside Open GL. It will utlise clock cycles from idling GPUs to take the pressure of the CPU. We should see some serious performance increases on all existing machines. Good stuff.
Still, I agree it is a great solution for experts who wish to tinker and for getting OS X running on non-Apple form factors.
As far as Netbooks and Apple are concerned? hmmmmm
I am not convinced about the demand for these yet.
Battery life / performance / size? hmmm
There are mumblings about a Mac netbook in 2009 and it's certainly a possibility however if I had to bet on it I would say "Yes, but not yet!"
Total cop out answer i know! lol