This is relative the prison-libraries question, but also expanding it: Has anyone looked at Google Gears? "Google Gears Beta is an open source browser extension that enables web applications to provide offline functionality..." I wonder if you could take a stripped-down OPAC (or LT) and make it work both online and locally. it could be a good halfway house for libraries that have web access, but not continuous web access. Also, I want to search my library while flying cross country—woo hoo!