I'm currently using a 1.33 GHz 12" G4, and it's quite nice (though a bit slower and smaller than I'm used to).

And please nobody yell at me about security! I'm fully aware of the risks, and I'm keeping it offline most of the time (except now, obviously), and I am considering installing Debian on it, so that it's more up to date.

In the meantime, I have disabled all sharing services and enabled the firewall (better than nothing, right?)

I will get a better machine, like a new MacBook Pro or new-ish Non-Retina Macbook Pro, *eventually*.

c