I still think the best thing BN could do right now is to put the inventory levels of every bookstore on the store pages. I know they have them all on their intranet, since they can do searches of near-by stores to see if any neighbors have the book you are looking for. I'd just love to be able to go to bn.com and have it tell me which store (if any) I can go to today to get the book I want.
As it is, I mostly just go straight to amazon if I'm looking for a computer-related book, a sci-fi book, or a fantasy book, since my local bn's selection tends to be a bit lacking...