The CQ100 system is amazing and works very well indeed. It has brought the joy and fun of "ham" radio to many who cannot for various reasons get on real HF. Even though I very much enjoy the real ham radio experience as a keen QRPer I also have enjoyed CQ100.
Now, a nice development would indeed be a handheld transceiver frontend for a PDA on a 320 x 240 pixel screen. If used with an 802.11 wireless link you'd have the fun of internet ham radio with a real 2.4GHz handheld transceiver.
I appreciate this is a lot of work so not expecting miracles overnight.