Using Arduino-based hardware, a pan/tilt sensor, and some bridging software amccoy6 has designed and documented a method of controlling a webcam (or anything else with some application) from a web browser. If you webcam was connected to a live-streaming service - then you can make a simple remote surveillance system. With some imagination the possibilities are quite interesting.
Although this type of project may sound complex, it isn't and could be completed over a lazy weekend. The hardest part is most likely finding a lazy weekend! Nevertheless, to get started check out the instructions page here. And we're on twitter, so follow us for news and product updates as well.
If this sort of project intrigues you and you're new to Arduino, the first step is a solid board for your projects - our Freetronics Eleven - the Arduino-Uno compatible with low-profile USB socket, onboard prototyping space and easy to view LEDs: