I will hold on until you can get on to a Mac.
Well unless one falls from the heavens, that won't be anytime soon, so I will give it one more shot and try go by memory:
In the Publisher you can hit the Publisher Properties... button and select Print or Save files.
Let's say you select Print. All your icons will change to print icons and you can select any kind of printer available to you. If you select a printer MacOSX will offer to Save it as PDF instead. Even though it says 'Save as PDF" in the Print dialog, it is still a Print as far as Publisher is concerned, because that is the Publishing method you chose. I do not know of a way of printing/saving a multipage PDF using this method. In fact I thought it was automatically a multipage PDF, but I must be wrong.
Now let's say you choose Save files in the Publisher Properties dialog instead of Print. If you have the PDF Converter installed, you should be able to select PDF from the drop down list under Publisher's Format tab at the bottom. All your icons will turn to PDF icons. So as far as Publisher is concerned you are now Saving as PDF, not printing. If your publisher set is contained within a folder, you will be able to select that folder and use the 'Merge to one PDF file' button under the format tab, as per Ben's attached image. When you do this, you folder icon will appear with a red bar across the top left of it to indicate that everything in it will be included in the PDF.
That's about it - I hope my memory serves me correctly!
Cheers,
Link.