If you really want to sink in the theory quickly and efficiently, do the guitar fundementals videos here (in the core learning system) and on the side read a book on theory of music applied to guitar.
Keep it by your bed and read 2 or 3 page (or more, depends on how tired you are :)) before sleeping. Make sure you choose a book that as exercise in it. It will help you remember what you learn better.
What ever you do, always remember to go try it on your guitar when you have time.