I haven't posted anything about it yet, but I think a lot of you have heard about it already, as Sean talks about it constantly. He and I have been building a modular marble machine based on plans from this site. It's taken a long time, and it still isn't finished - but it's definitely in a 'playable' state right now. Next time you're visiting, ask Sean if you can see it. I'm sure he'll be more than happy to oblige!