cd ~/Library/Application\ Support/Sublime\ Text\ 2/Packages/
git clone git://github.com/jancassio/SublimeAS3.git ActionScript3
You'll need to remove the old AS Package, to do so, execute:
rm -rf ActionScript
Make sure the Flex SDK is available in your PATH (by adding it to your .profile or .bash_profile)
cd ~/Library/Application\ Support/Sublime\ Text\ 2/Packages/ActionScript3
git pull
This is a port from the AS3 TextMate bundle.
Work in progress and still very alpha.
Use at your own risk!
Contextual autocomplete
Create project script
Dump SWCs in a regular interval