AB's Useful Box - Post Script to PDF
Linux has an excellent tool for converting Post Script file to PDF files, it simply called ps2pdf.
This is really good, however the problem is, especially from Windows, is what driver to use to produce a Colour post script file.
Found the answer on Ken's howtoPDF page, user printer = Tektronix Phaser 300i
Not only does it do colour, but is also does A3.