Not even a fan the iPod Touch. Which I also owned. Actually, it's pretty cool as long as you are not an audible book fan. The way it shows chapters not good. Best device I ever owned for audible content is the Creative Zen Moziac. But the Zune is pretty good, too.
Actually the regular iPods do a better job with Audible. Not in terms of sound quality. Specifically in how it shows your location in the book.
I'm actually interested in that new Zune HD myself. I'd switch to the Zune except that managing music on the Tour is made easy via that playlist function in Media Sync, which works with iTunes, not Zune. If RIM made it "Marketplace" aware, I think I would ditch iTunes. It feels extremely bloated on the PC. I am sure it's awesome on the Mac, but on the PC, it's not a good application.
Sorry, don't mean to be so down on Apple. Nothing against them at all.