Sublime Text 2 does not pickup the correct $PATH variable on OS X. It's configurable in ~/.MacOSX/environment.plist and most GUI programs use it. Sublime Text 2 should use this as wel.
Apparently ~/.MacOSX/environment.plist is no longer supported in Mountain Lion. I haven't tried it though.
Looked this up a bit, and it seems there's no way to set environment variables on the user level any more in OS X Mountain Lion. See this for more info: http://cumptrnrd.wordpress.com/2012/09/18/setting-environment-variables-in-os-x-10-8-mountainlion/
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