I have Acrobat Distiller at work, and I've tried uploading PDF files, but those haven't worked because I didn't embed the fonts. After considerable poking around, I think I've found the "embed fonts" button that works for this particular print operation.
I'd prefer to use the PDF file, because it looks exactly the way I want the book to look, whereas the converted Word Perfect file looks pretty darn close. But if the new, improved PDF continues to not work, the WP file will do.
I have a color cover uploaded, and am working on a back cover. I don't have any quote reviews yet, so I may just have to put together my own blurb. With luck, I'll soon have a quote review by Larry Niven, and a URL I can send people interested in purchasing my book to.