What Formats can the Reader use ?
Blio allows rendering of DRM free EPUB files. We do have the function for PDF files as well (iOS only I think) but the text to speech and highlighting functions only work on text based PDF files. I have built some tools that will convert doc, docx, rtf, epub, or pdf into Blio format, but its not yet deployed. If you are interested in beta testing it, please let me know.
The Quark/Blio relationship pretty much dissolved some time back (I believe the people in both companies who had dealt with the relationship left the company). If you are interested in the PDF to XPS conversion, please take a look at the email I sent you.