As a starter for 10, here's a project I worked on a couple of years ago when I was first introduced to the Arduino platform.
It's from the days before Tower Bridge stopped tweeting (now back online under a different name), and so the code is a little out of date (in terms of the account it links to) and is a little rough around the edges, but it captured my attention for a fair while, and was a great way to be introduced to the communications potential of the Arduino (something that is a particular focus of mine now).
As a brief aside, I would love to use this opportunity to plug the nanode. When I made the tower bridge project, the combined cost of the arduino and ethernet shield was over £50. For only £20 you can now get a single board with all of the same functionality. We are hoping to roll these devices out more widely to our students, and see what other great networked projects we can create.
All part of the Internet of Things!
I hope you enjoy this blog as it develops over the coming months.