gDoc Creator (64-bit version)
Some documents are better shared as PDF files, rather than as Microsoft Office documents--but how can you convert native Office documents to PDF? The answer is simple: Use gDoc Creator. This free software easily converts Office 2003 and 2007 files to PDF files. Available in 32-bit and 64-bit versions, it runs as an add-in to Office, and is available from the toolbar. It not only convert files to Adobe's PDF format, and e-mails them as well. It also converts and e-mails files to Microsoft's rarely used XPS format.
GDoc Creator gives you a great deal of control over your PDF conversion. You can create a single PDF for the entire document or one for each page; you can crop documents and convert the cropped area; you can add a watermark to the PDF; and plenty more.
If you use Office 2007, Microsoft makes available a free download that can convert Office files to PDFs, but gDoc Creator offers more options for conversion than does the Microsoft add-in. Microsoft's add-in creates the PDFs slightly faster, though. If you don't care about options such as creating individual PDFs for each page of a document, you'll be fine with the Microsoft add-in. But if you want more options, gDoc Creator is a better choice. And if you use Office 2003, you'll want gDoc Creator in any case, because Microsoft doesn't have a free PDF converter for that version of Office.
Note that the software also downloads a trial version of gDoc Fusion, which has more powerful capabilities than gDoc Creator. With gDoc Fusion you can create one PDF for each page instead of a single PDF for the entire document; you can crop documents and convert the cropped area; you can add a watermark to the PDF. Also, the first time you use gDoc Creator, you will have to fill in your name and e-mail address to send to the developer, although you will not have to pay for it.
Note: As of 3/26/2/13, this software has been discontinued by the vendor and is no longer available.