I'm a developer and hobbyist. Websites and programming is my thing, and the Raspberry Pi is most likely the best ARM device for $35 on the market. Also, I'm getting into Python for the Raspberry Pi, especially home automation over the GPIO port.
The "pifm" radio transmitter was the best thing I've seen in a while, and I'm further developing the PiFM project with text to speech. I'm planning on buying an FM receiver, for 2 way internet access over FM (modem).
I don't have a lot of time on my hands on those kind of projects, but I have developed a system so that the RPi is fully portable. This will be extended with a small dot-matrix 16x2 screen with buttons.