X11 is a mac OS implementation of the typical linux/unix X server for displaying windows etc. But what can it really do? Personally, I've just installed fink from http://fink.sourceforge.net, along side the apple developer tools available from their mac os x installation cd/dvd. Running 'fink list' shows the endless possibilities for software that can be installed, such as the pine news/mail reader, or the GAIM instant messaging client. Handy. What is everyone else using their x11/unix for? Anyone doing cool things, or with cool ideas, why not share.