Okay, I don't have the time to learn to make it myself, so I'm looking for someone that can!
I'm after an extension that will allow a user to input a books ISBN into a field, and then have it use something like google books API to automatically populate certain fields with the relevant information (title, author, cover photo, blurb, publisher etc). It would be used for things such as book review blogs, "libraries" (see library.literarywombat.com for an idea of what that means) and book ecommerce.
I'm happy to hire someone to do this, so if it's something you're interested in, please let me know! Or, if you can, point me in the direction of someone who can.