If you are reading this old post, you may also be interesting in reading this post.
Robin2 gave me a good starting code example.
I managed to adapt his code to 57600 baud and can listen to other arduino's great. I'm still battling on to understand what the V1 is actually putting out using a cheap logic analyzer. The V1 Technical document states 57600 8 bits no parity and 1 stop bit, but the analyzer can't make heads or tails out of it (neither can I yet). :o