So, i found someone selling one for $150 on yahoo - which I just paid for. I'm hoping I'm not going to get burned on this. There are a few retailers sellin them for around $350 which is silly.

I've spent some time thinking of this, and it seems like what you'de need to do is first use something like ntp to sync the time on both rio's, then determine how long each frame of data should take to decode. The various rio's pick a time in the future to start, they both wait till that point, then they start at the same time. They also would keep track of how much time has elapsed and what frame they should be decoding. If they're ahead, they pause. if they're behind,they skip frames till they catch up. the key being that they both start the decoding of a frame at a key pre-determined time. But that's just my theory so far.