Control Spykee using a local wi-fi signal or remotely via the Internet. It can detect movement and automatically notify you, so you have a burglar alarm of sorts. It can also just be a webcam, for you to use with Skype or whatever. It is also good ol' Meccano, so you build it yourself and can add to it.
As of May 2009, it is £154 from Amazon.
Be a part of the Spykee World. Strangely the UK site has been flagged as containing harmful software, but I couldn't find anything harmful on it when I visited the site.