Primopdf
Got a couple interesting comments on the Convert PDFs for Free post and one reader, Melissa, made this suggestion for another free PDF converter software:

Another option is PrimoPDF (http://www.primopdf.com/)- It installs as a print driver and enables you to convert anything that you can print. I have used it for a couple of years and love it. And it’s free.

Thanks for the tip Melissa!