Some ideas for things to code
i) A predictive text engine for using SSH from a phone
Port of putty to a microsoft smartphone
ii) Add rtsp:// wget so that streams can be downloaded for listening to later (podcasting)
Could use this library or Helix client.
iii) A P2P VNC like application sharing program. To help other people with their computers
This is already possible a way to get through firewalls is often needed. See here for how to do this using VNC + SSH. Why did Microsoft not get this right with the "Remote Assitance Wizard" in WinXP. Maybe Skype could add this.