Web-Based Message Boards with Offline Reader?

Biedermann asks: "I have been looking for web based messageboard for ages. The Problem is: the users should be able to log in, get the new messages, log out and read/write offline. Not everybody has low-cost-always-on-broadband access to the net. All the programs I could find were either not keeping promises or fell unmaintained years ago in beta. Is there any such beast? Or would it be possible to do such a thing with Slashcode or Squishdot? (I'm not a coder, so I don't know what it takes)" I've been thinking about writing something like this for Slashcode but haven't yet had the time. Do you all think this would be a worthwhile application?