Home security cameras are getting more common, especially with Linksys. The Linksys Wireless-G Internet Home Monitoring Camera WVC54GC features 802.11g and 10/100 Ethernet connections, and VGA video recorded to a MPEG-4 or Motion JPEG codec. The camera can be limited to local network video streaming or opened up to the internets both publicly or privately. The camera is now available for $120.
