don't know much about broadcaster, but whenever someone asks me this, i direct them to evocam from evological software. it's the best webcam software fro the mac i know of, and they are very committed to keeping up with drivers and compatibility with a ridiculous number of hardware units out there. you can use it for your own home webcam to make sure the dog doesn't get on the couch, or an entire security camera network manager with motion detection etc, for $25.
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EvoCam from Evological.com
hope that helps.
When I went back East last summer to visit my family I set my iSight up and used EvoCam to watch my cats.
It's has a built-in server and it's very easy to set up.