I have a page on my Resources site devoted to file conversion resources. Here are a couple of new/updated entries today.
CuteFTP: FREE. "Create PDF files on the fly. Save fillable PDF form using Reader. Add, delete, rotate, resize, reorder pages. Stamps, overlay, headers, footers, bates. Make compact PDF booklets. Digitally Sign PDF Documents."
PrimoPDF: FREE. Recommended to me by several professionals. PrimoPDF becomes a "printer" on your applications' printer lists--instead of printing the document on paper, it puts it into a PDF. Any application that can print can make a PDF with this. "Convert to PDF from 300+ file types...optimize for print, screen, ebook, or prepress." OR you can purchase their nitroPDF Professional: "Create, edit, view, secure, form fill, annotate and sign PDF files; and do it all on-screen." (free 14 day trial) PrimoPDF gets good ratings on CNET.
I just read that the older version 3 works better than version 4. Here's the link to version 3.