You can encrypt X sessions over SSH. Not only is the traffic encrypted, but the DISPLAY environment variable on the remote system is set properly. So, if you are running X on your local computer, your remote X applications magically appear on your local screen.
Turn on X11 forwarding with ssh -X host. You should use X11 forwarding only for remote computers where you trust the administrators. Otherwise, you open yourself up to X11-based attacks.
A nifty trick using X11 forwarding displays images within an xterm window. Run the web browser w3m with the in-line image extension on the remote machine; see the Debian package w3m-img or the RPM w3m-imgdisplay. It uses X11 forwarding to open a borderless window on top of your xterm. If you read your e-mail remotely using SSH and a text-based client, it then is possible to bring up in-line images over the same xterm window.
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