Thanks, Pooks!
Looks like the new app rolled out in early September and I know I bought my KOBO before that.
You can download it here, but I don't think there's any way to tell what version it is until you've installed it and can check the properties:
http://www.kobobooks.com/desktoppromo
There's also a nice 2 dollar discount on the purchase of one of three books.
I'm gonna go home and figure out the Calibre tonight. I downloaded it here at work, but it doesn't show book covers like the KOBO app does. Hmmm...