If you will start looking good for IP camera, you will see that they cost decent amount of cash. If you are looking to use one for your own needs like home security or office monitoring, then look around if you have spare Raspberry Pi and camera module. These things are cheap. Antoine likes to have control over things, so he started an Open Source project where he builds FULL HD (1080p) IP cam that can stream video at 30fps. It sends standard H.264 encoded video over RTSP protocol which is used in security applications.
As camera housing he used standard camera dome that can be found on eBay. To power the Raspberry, he implemented simplified PoE (Power Over Ethernet) on two twisted pairs from DC power adapter. The software part is based on Raspivid and Live555 RTSP Library. To get it working Antoine wrote step by step procedures that you need to follow in order to get it working. After some configurations made via WEB interface camera can be accessed through media player like Open VLC. Camera does not support night vision, but by adding NoIR sensor and IR light source, it can be possible. Also he plans of adding PIR detector to activate camera. Also he wants to enable recording of videos from web interface. So hopefully we will see some great updates.