I have been reading the whole thread, but this one made me jump in. I own a VAIO Z series and it is a kick ass machine. I have windows 7 running without any problems by using most of the Windows XP drivers from the Sony website.
I agree that Sony are morons for not supporting future OS and linux, but we all know that there is always a way around. Also want to add that the Sony laptops, and particularly Z and F series are very well designed and very sturdy compared with the other brands that tend to make their new modesl cheaper and cheaper looking and feeling.