Yeah... I just bought the desktop app, and I'd love to be able to use my iPhone to add new items to the system. I realize there's not the fine control over the camera that would be necessary to make the barcode scanning as interface as the desktop app (moving from product to product), but even if it were about entering a bunch of ISBNs and snapping photos of items (especially tools, but book covers as well), it would be excellent.
But, again... if Apple would allow the finer camera controls (and overlays), that would open a whole lot of doors. I'd be happy with a pocket edition of Library though. I sware I thought they were working on this since way back. I was almost certain they're have been a release by now.
~ CB