What's a good network A/V broadcast/play kit for simultaneous playback?

Ipod. Definetly.

@astrix24 you can get multiple ipods to play the same thing at the same time synchronized ?
Please, How To ?
Or an iPod can play synchronized with something else ?
Among computers on a household LAN would be ideal… adding players on WiFi gizmos too if possible.
I don’t see know how they would sync up the actual presentation of the sound unless there is intercommunication and synched players. Somebody’s probably solved this out there…

That, im sorry. I have no idea to help you with. I misuderstood the question. In this case, I have no idea. Im sorry.

For audio, you actually can use an iPod or iTunes on your computer. Airplay lets you choose multiple speakers connected to Apple Airport Express routers or Apple TVs.

I am not sure if you can stream video to multiple sources.

Airplay

Apple AirPlay: 10 things you need to know