How do I setup Python3.3 and Sublime Text 2 correctly on OS X 10.8.2?
Add "path": "/Library/Frameworks/Python.framework/Versions/3.3/bin/" to your Python3 build file. Mine looks like this:

{
    "cmd": ["python3", "-u", "$file"],
    "file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
    "selector": "source.python",
    "encoding": "utf8",
    "path": "/Library/Frameworks/Python.framework/Versions/3.3/bin/"
}


Note: Make sure the path to Python3 is relative to your machine - that was true for mine