Apologies for the double post, forgot to post to the listserv (maybe other people can get some info out of this too):

You might try using kpdf... apparently okular is based upon that.
That's located in the kdegraphics package.  However, it looks like okular is specifically the one that reads xps.

There is also ghostxps which can apparently convert from xps to pdf format. (you'll probably have to compile that, but it's easy!)
http://www.ghostscript.com/download/

Christopher Tooley

On 2011-09-15, at 8:52 AM, Stephen Isard wrote:

> Can anyone suggest a way to read Microsoft's XML Paper Specification 
> (.xps) files on SL5?  I've found web postings saying that okular can 
> read them, but I can't find a version of that for SL5.  I tried 
> installing kdegraphics, but it wasn't included.  It's apparently on the 
> way for evince, but not here yet.
> 
> Thanks,
> 
> Stephen Isard