Wow! This is my first post of the year. I'm such a slacker these days!
In case you haven't seen this yet, a new company, Bug Labs, is coming out with a very cool hobbyist concept. It's a modular device development kit. There's a touch LCD module, GPS sensor, an accelerometer/motion sensor, a camera, and the base unit. Each device physically connects to each other and communicates via TCP/IP for the ultimate in easy integration. The software is all open source and there's an incredible array of features. Programming is via Eclipse (presumably Java-based) and an SDK is available.
The only downside is that the price is a little high ($299 for the base unit at early adopter pricing), but it's pretty unique in the hobbyist world. I'd love to get my hands on one of these sets to play with!
http://buglabs.net/