PrimoPDF

FREE! Convert to PDF from any application by simply 'printing' to the PrimoPDF® printer - it couldn't be easier! Within minutes, you can create high-quality PDFs by converting from Word, Excel, and virtually any other printable file type.

• Completely FREE PDF Converter - not just a trial version.
• Print to PDF from virtually any Windows® application.
• Create PDF output optmized for print, screen, ebook, or prepress.
• No annoying pop-up ads, no registration requirement - no catch!
• High-quality, easy to use PDF creator for all users.
• New! Ability to merge PDF files upon conversion.
• New! Now supports Windows Vista

Get it here: http://www.primopdf.com/