Well I'll be!
I was doing my weekly disc clean up and decided to browse through the items which were not "Ticked" for removal. Lo and behold, there was "Previous Windows Installation(s)" 13.7 gigs as well as some associated, temporary files.
A glance up at the top left corner of the box, was a notice advising that I could free up 16.2 Gigs on drive "C" by deleting these.
So I did!
I needed the space but it wasn't Vista which was taking up so much room, it was Windows XP.
As a matter of fact, according to my figures, Vista isn't taking up any more room then previous installations.
Maybe check this out if you're stuck for room as I was.
Problem solved & Vista getting more friendly by the minute.
Cheers!
Jim