You guys make great suggestions. I am especially interested in the handset application and have already developed some ideas for Voxalot / Sipbroker here:
Markus Göbel's Tech News Comments: Packet8 MobileTalk could be done much better
This week I will check out a handset application that automatically decides whether to connect a call by GSM, callback, callthrough or Wifi. Sounds great! Let's see if it will live up to my idea of a "mobile VoIP dream application".