Steve didn't mention it during the keynote, but it's been generating lots of buzz: Apple released a public beta of X11 for Mac OS X. X11 is the common name for the X Window System, used by Unix developers to create graphical applications. So if you have a graphic-based Unix app that hasn't been ported to Mac OS X, and you don't want to fiddle with Fink and XDarwin, like me, then download this installer and get started.