While doing my Day job in London, I'm on the train 5 hours a day, which I'm currently using for my own little experiment in creating Cyber Entities - NeuDist.
I had to delay the launch as I discovered a new Object database called Ozone. I've been working with it the past two weeks or so, it's pretty cool and has a persistent DOM in it based on openxml. I've been having problems with the fairly nonexistent security model though, so I might have to work a bit on that and submit it to the ozone group.