PDF Creator at SourceForge
The PDF file format has got to be one of the most useful file formats ever created. I use PDF's daily in both my personal business as well as my real job. I even have a scanner at home that can scan to PDF. While I occasionally need features such as annotation or commenting, I usually just need to create a PDF file from a Word document, PPT presentation, or spreadsheet. I own an ancient copy of Acrobat that is installed on one of my computers, but I have to wait until I'm home to create PDF files.
I have found a great PDF creator tool that is open source. You can download PDF Creator at SourceForge, install it, and be printing to PDF in just a few minutes. All for free!
Also, thanks to my buddy Benjamin Craig for turning me on to Foxit Reader which allows annotation and commenting for any PDF file.