Per a post on these forums, iCam supports audio for the following IP cameras:
AirLink101 SkyIPCam500
AirLink101 SkyIPCam500W
AirLink101 SkyIPCam747W
The bottom 2 cameras are wireless, I am assuming. I know there are other cameras that also support audio, because I've seen them mentioned over the past few months....but I can't recall which brands/models. Also, I believe the bottom camera has the ability to pan/tilt/zoom (in addition to supporting audio)...and iCam supports that feature. This would allow you to look around the room in iCam (and hear in on it) instead of seeing only one spot...handy for keeping an eye on the kiddos. In fact, I think that camera also has night vision...just make sure you don't mount it behind glass (the IR reflects off and blinds the camera). Good luck!