I did use Wubi - Ubuntu installer for Windows on my IBM Thinkpad T61 (it’s still hard for me to call it Lenovo) and got fully working Ubuntu 8.04 x86_64 bit working on my machine. NO ISSUES at all: wireless, trackpad, touchpad, sound card, graphics card, everything works. simply works. I already have Python 2.5, Scipy/Numpy, Matplotlib, IPython, PyQt4, Qt  Designer, Firefox 3, OpenOffice, fully productive for two days, enjoy every minute. Try it yourself.