Roomie,
I have confirmed that the following Pioneer Plasmas can be controlled via IP: PRO-101FD, PRO-141FD, KRP-500M & KRP-600M. (Use port 4201 & enable IP control in display menu settings)
I have also confirmed that the following Pioneer Plasmas can be controlled via serial port: PRO-110FD, PRO-111FD, PRO-150FD, PRO-151FD, PDP-5010FD, PDP-5020FD, PDP-6010FD & PDP-6020FD. (iTach adapter must be set to 9600 baud rate)
I hope this will help update your compatibility list & other satisfied Roomie user like myself!