The Wall Street Journal pointed me to LibraryThing, a new social networking site based on the contents of your bookshelves. I dug into it and found a very cool feature: you can give it your Delicious Library database and it will import all the books (based on recognizing ISBN numbers) into your online bookshelf.
I haven’t played with it yet but you can bet I will when I get home. This is a near perfect marriage of offline and online functionality: scan a book with your iSight, upload the record in one step, and you’ve published it online. Very cool. Thought this was functionality that should have been in Delicious Library from the beginning.