I'm using connectBot for my SSH client. http://code.google.com/p/connectbot/

It's a little tough with the soft keyboard, but with external kbd ...

You can connect to other machines, and to "Local" for fun exploring ... I was surprised I could get to /bin and run top ... without a real kbd I could not exit it though

[EDIT] After I RTFM ... I discovered that a single click of the trackball = ctrl and a double click of the trackball = esc ... this help, but still need a better virtual keyboard