This is an instructable on how to stream your minecraft gaming sessions to twitch.tv.
To begin this instructable you need:
1) A migrated minecraft/mojang account (if you sign in to minecraft with your e-mail address, you have this)
2) A twitch.tv account
Step 1: Sign in
The first step is to sign into your mojang and twitch.tv accounts in your web browser.
Step 2: Connect your accounts.
Click on the 'connect to twitch account' button in your mojang settings to link your twitch and mojang accounts.
Step 3: Success!
Now sign into minecraft and press the f6 button on your keyboard (make sure you are using minecraft 1.7.4 or above). It should ask you to download soundflower (here is the download link).