Big thanks to both Mad5427 and to Scion.
I got my NC 2 days ago and have naturally been tweaking the hell out of it ever since. I'm running ADB and finally don't have any reason to load the B&N launcher! Calibre's file structuring with the cover images is a major blessing, and using Mad's widget method to get covers as shortcuts onto the homescreen is just AWESOME. I finally feel like I've got an awesome tablet with some powerful eReader software behind it.
Here's a screenshot -- it's a cam shot as I don't have my sd card installed right now to save screens to (left it at work over the holiday -- doh!)