I've got a couple old books that are nearly falling apart... might be fun to try a scanner with auto feed. Destroying the books wouldn't be a problem at this point. Are there any decent and cheap ones that will take a scan of each side and keep the pages in the right order?
Once I have the images it would be easy enough [though perhaps time consuming] to reformat them as a PDF and use the built in OCR in Adobe Acrobat. Are there PDF to mobi convertors?
Even though each step may take a long time, if I can get a system working that only requires a small amount of user input between these large steps, it might be worth my while.