Amongst other interesting things, Rich Olsen has described how to make an interesting laser show that can be used to display various patterns and text using a wide variety of hardware, a laser pointer and two home-made galvonometers. If you ever want something to do on a rainy weekend, this project would be a great start, and is open to all sorts of modifications (e.g. displaying tweets). For an example check the following video:
As a side note, always take care with laser pointers and don't allow them to shine into the eyes of anyone. For a complete description of how to make this, check out Rich's instructions here. And we're on twitter and Google+, so follow us for news and product updates as well.
If you are new to Arduino and looking to make your own projects, join in with our range of Arduino-compatible hardware, prototyping shields and module range. A good start is the Freetronics Eleven, the Arduino Uno-compatible board with onboard prototyping space: