There's something else cool about the Qsonix implementation. Like Sooloos, you advance pages of cover art on their touchscreen via the slider at the bottom or by forward and back arrows. It appears that since Qsonix couldn't properly integrate their drag and drop functionality on the iPad app, they decided instead to use horizontal smooth scrolling. So, to navigate forward and back on the cover art view, you just slide your finger across the screen and in doing so is very consistent with how some other apps operate.
All in all, I think Qsonix did a pretty darn good job on the face of it. If anyone out there gets a chance to play with it, I'd love to hear how well it works in real world testing.
Jeff