Peter: you could add it as an offline Apache Cordova app as well, although you would have to be on the lookout for:

- Synching between apps (a fairly straightforward process, but still has to be done, given enough interest on the app [which it looks like you might have])

- System Webviews != Chrome or Safari (depending on iOS/Android version).

I would be happy to hunt this on ProductHunt as well, hit me up on twitter http://twitter.com/joantune if you want to schedule a date or simply reply here and I'll post it there.

Cheers, and good job, it looks good