None of the above. I am tempted by Natal, but not enough to justify buying a 360 for it. I'll "make do" with Move for gaming uses.
Most likely (given it's coming on PC) if/when I upgrade to a new PC I'll look at Natal for the PC depending on what applications are available on that platform.
If I can talk to my PC (like with Milo) and tell it to do certain things then that would be pretty useful (and cool). Even better if I can get my PC to read out my e-mails and other such things (read me an e-book) that would save a lot of screen time and eye strain.
I'm certain Natal will make it to my house eventually.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix
