I have been using Office 2007 for some time now, and I just ran across a free download from MS:
2007 Microsoft Office Add-in: Microsoft Save as PDF or XPS
I like to save many of my documents as PDF, since they readable/printable across many platforms. I have been using FinePrint’s PDF Factory – but I don’t have a license for every system I use.
It turns out to be a great alternative. Simply download the plugin, and within any Office 2007 application you will see a new “Save As..” option:
I have tried it out on a few documents and it works great.
If you are looking for a quick and easy way to save to PDF in Office 2007 I highly recommend it.