Note: This version is slightly modified from the original. Creating a symlink to subl did not work for me, but copying did. The disadvantage of this approach is that you have to copy subl in Sublime Text.app to /usr/local/bin every time subl is updated. Try the original guide first if you want!
Sublime Text 2 ships with a CLI called subl (why not "sublime", go figure). This utility is hidden in the following folder (assuming you installed Sublime in /Applications
like normal folk. If this following line opens Sublime Text for you, then bingo, you're ready.
open /Applications/Sublime\ Text\ 2.app/Contents/SharedSupport/bin/subl
You can find more (official) details about subl here: http://www.sublimetext.com/docs/2/osx_command_line.html