As an composer, arranger and copyist, it's important for me to be able to have all my sheet music in PDF format so that I can email it to other musicians for rehearsing. Unfortunately, when I purchased a new computer (and forcibly upgraded my trusty Windows XP to the new Windows Vista), I was completely dumbfounded at this new Microsoft XPS file format that I had to deal with. I used to be able to print any Finale file as a PDF, but now I had to get creative. Recently, I found this blog post on the subject, and now I'm trying to spread the good word! http://blogote.com/2009/ideas/how-to-ideas/convert-xps-to-pdf-file-for-free.html
Basically, the salvation lies in CutePDF. It simply adds the option to "Print file as" for PDF conversion. Download from their website and follow the easy instructions. Thank you, CutePDF!