you need to use the LaTeXTools plugin:
I'm the author, and I apologize for not having written down clear, simple instructions... I promise they're coming! You can find some basic info here:
tekonomist.wordpress.com/2011/03 ... -text-2-4/
This tells you how to set up forward/inverse search with Skim. One correction: the setup instructions for Skim say that the command should be "subl"; that's OK if you have created a symlink to the Sublime Text 2 binary. Otherwise you can enter the full path, which is
/Applications/Sublime Text 2.app/Contents/SharedSupport/bin/subl
From ST2, forward search is launched with shift+cmd+j, or whenever you build (compile) with cmd+b. Reverse search in Skim is activated as usual with shift+cmd+click.