Since many of us seem to be using the wireless X10 camera's for security monitoring, I figured I would post this link to this very interesting article. It shows how people are driving around with 'special' equipment trying to tap in those wireless feeds. This is an issue that has been mentioned before, and more people seem to be doing this, so I hope this article will make you reconsider using wireless camera's for indoor (and outdoors) use if you are serious about security and privacy.
Article:
http://www.securityfocus.com/news/7931
Article:
http://www.securityfocus.com/news/7931