The .NET Micro Framework book is coming along OK. And I've managed, by means of some clever wangling, to get myself permission to buy a robot vacuum cleaner as part of the job.
The reasoning is that we need something to control with our Micro Framework device, and the Roomba vacuums from Irobot look fun. And you can control them via a serial port. So I've been digging up references and making plans. Should be fun.