You could try using
Kinoma Freeplay (which can connect to Orb directly) or use
TCPMP with the
wmv plugin (as the replacement for WMP by chaging file associations).
I'm currently using Kinoma as TCPMP seems to crash on me after playing a orb stream for 20 sec. Both of them run orb streams at pretty close to full speed over a stable EVDO or wifi connection.