I'm always looking for ways to stay knee deep in it. So I was really pretty stoked to run across this great list of screenwriting podcasts. I suggest you take a listen and bask in the tribal knowledge these guys share.
I've only dug into Scriptnotes with John August and Craig Mazin - the site is a treasure trove of info for writers - no matter the medium. If you're even mildly interested in the written - and the long running debate of whether there should be one space or two after a period - then this is the place for you.
Let's get our game on.