I'm starting to think you're a mind-reader tonight...
Showcase is in the planning stages right now. We've seen some great sites out there, yours definitely included, and we agree, it's time to promote (and use to our advantage) those sites. With luck, we'll have something up by the end of the year. That's the goal at least, but as you know, we're also working on a LinkedIn extension, as well as standard JFBConnect development, so 'side' projects don't always get the priority they need. We're also in the process of bringing on more talent which will be very welcome and should help us keep up our current pace of development (which we think is pretty good).
As for offline access, for 4.1 we're planning to start storing the authentication token and make it easily accessible.. not sure if we'll do anything with it at that point, but developers easily could. After that, we have plans to start doing a lot more with offline access in future versions. Now that 4.0 is out, we're really starting to scope out 4.1+, so nothing solid yet.. but have some good ideas of neat features
Feel free to pitch any suggestions!
Alex