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Have you set up SSH to use keys instead of passwords? That increases the difficulty an attacker faces by a good deal. Most automated attacks try to hit port 22, so consider running on a different...

I believe NX can do this. I'm not sure if FreeNX can yet. Both are worth looking into, if only for the better speed they offer in comparison to VNC.

If you wanted to hack something together you...

It's not normally safe to open a power supply. They retain current long after they've been disconnected, IIRC.

Advising people to buy more RAM is the wrong way to approach a slow system. The first thing is to figure out what is slowing the system down.

What is the output of top? What services are running...