Methods to install X11 on Lion My girlfriend recently ordered a MacBook Pro with Lion installed. For an online class she needs GIMP which depends on X11. What are my options to get it? Is there any Apple-sanctioned way to do the install? Would there be any downside to using the SL DVD from my machine? Or should I just install XQuartz?
As a matter of fact Lion DOES ship with X11. There were many doubts, and many believed it wouldn't, but it does. 

Source: me. Ive got xeyes running on my Lion iMac right now. :)

Another Source: Apple. http://www.apple.com/macosx/apps/all.html#x11