So far, you seem to need an external keyboard for it, but with bluetooth keyboard, both X11 forwarding and VNC work very well, provided you stay within the LAN or on a very fast network connection.

You'd need a pristine UMTS connection to do serious work on a cellphone forwarded session, though, and even then, you will frequently encounter screen update delays of several seconds. On EDGE (with its poor round-trip time), plain GPRS (with similar RTT and no bandwidth to start with) or on a congested network, it is beyond being merely painful - you risk damage to your data when blind typing with response delays up a minute or more...

Sevo