CC PDF Converter is a free desktop based PDF printer software that helps you create PDF files from any windows application including Microsoft Office, web pages and so on.
Why another PDF writer when there exist tons of good alternatives like doPDF, Scribd, etc? There are two advantage with CC PDF Converter - first, it is open source and second, it has an inbuilt Creative Commons License generator so you can suggest how the PDF file should be used/shared by others.
You can embed any Creative Commons license into a PDF document easily or even put that as a stamp at the bottom of every page (watch this screencast demo).
This PDF converter is much similar to the Creative Commons Add-in for Microsoft Office that enables you to embed Creative Commons licenses directly into Word, PowerPoint, and Excel documents - the only difference is that you are not limited to MS Office and the CC license is added to the PDF file while the source document remains untouched.
CC PDF Converter [From Cogniview, the same developer that makes the PDF to Excel conversion software.]
For converting pictures or documents to PDF without installing any software on your desktop, try KoolWire - an email based PDF conversion engine.