This is a bit older news now, but still, it's pretty awesome. The XPS Essentials Pack is now available for download from http://www.microsoft.com/xps/ . Among other things installing it on XP gets you an XPS viewer & the Microsoft XPS Document Writer...

We've released the final version of Print Schema, and it can be downloaded from here: http://www.microsoft.com/whdc/xps/printschema.mspx Thanks everyone for the great feedback. Ben