Sun keyboards have a few differences from normal 101-key keyboards. One is that the locations of the left Control and Caps Lock keys are switched. If you use the Control key often, this makes a big difference, ergonomically. Here's how to switch the left Control and Caps Lock keys on normal keyboards, on any *nix platform that runs X Windows.

Add these two lines to ~/.Xmodmap:

! Switch caps lock and (left) control
remove Lock = Caps_Lock
remove Control = Control_L
keysym Control_L = Caps_Lock
keysym Caps_Lock = Control_L
add Lock = Caps_Lock
add Control = Control_L

Now load the changes into X:

$ xmodmap ~/.Xmodmap

Voila! You're now one step closer to Sun keyboard bliss.