Arduino team member Tom Igoe has found an interesting feature (or loophole? You decide) within the pachube/cosm online data graphing service that allows your Internet-enabled Arduino board to send a tweet. Although there are already a few Arduino-twitter solutions, this one is good as you don't need to muck about with third-party authentication. Thus your Arduino can now tweet with the stars or let you know more relevant data.
When putting together your next Internet-enabled Arduino project - save time, space and money with the Freetronics EtherTen. Apart from being fully Arduino Uno-compatible, it has onboard Ethernet, microSD socket, full USB interface (so you don't need a costly FTDI cable just to upload a sketch!) and supports optional Power-over-Ethernet.