I recently installed Open Suse Linux on a Vaio and was expecting to have to install all kinds of extras for hardware compatibility, but was surprised to find that everything worked "out the box". I was expecting to have to install drivers for the touch pad, usb ports etc, but they all worked fine.
This link maybe helpful if you do run into any problems
http://www.linux.org/docs/ldp/howto/VAIO+Linux.html
(although just noticed its dated 1998....but like i said, my installation on a vaio required nothing added so maybe recent versions support the vaio better)