Links mentioned on this tutorial:
Twine is the simplest possible way to get the objects in your life texting, tweeting or emailing. A durable 2.5" square provides WiFi connectivity, internal and external sensors, and two AAA batteries that keep it running for months. A simple web app allows to you quickly set up your Twine with human-friendly rules — no programming needed. And if you're more adventurous, you can connect your own sensors and use HTTP to have Twine send data to your own app.
The Raspberry Pi Foundation announced this week that its $35 Linux computer has entered the manufacturing stage. The system, which is an open board with a 700MHz ARM11 CPU and 256MB of RAM, could be available for sale within a matter of weeks.
Raspberry Pi intends to offer two separate models with different hardware specifications. The initial manufacturing run is focused on the "B" model, which is the higher-end $35 configuration. They will follow it up with an "A" model for $25 that will have half as much memory and lack hardware features like an ethernet controller.