Andreas Karlsson has something better - a working release of an ssh client for an Ericsson P800. This sort of thing would be absolutely ideal, being that ssh has a range of functionality but is also very secure. There is also work underway for a VNC client as well.
Ultimately, I expect that the mobile phone will evolve to become a kind of "remote control" for the home PC system. I expect the mobile to change into an all-in-one device that handles calls, acts as a PDA and also as an ssh client. Who knows... perhaps the next version of windows will have remote desktop server for mobiles built in....??