David Berlind has an interesting post about the potential of Derby as an offline storage mechanism for thin-client web-apps. I can see the potential and an awful lot of difficulties as well. Might I suggest the perfect integration point for this kind of thing is a really cool Java WYSIWYG editor?

Hey Andrew (CEO of Ephox and a big fan of offline editing), can I have some time to try and prototype this on Ephox’s internal wiki? You could edit your wiki pages offline easily…