It works just like the Monday codes (read my Monday post here). It expires at midnight tonight, but you can use it more than once if you use separate credit/debit cards.
So, we get free movies on Monday and Wednesday! =)
Today's code is: JBG123
("BREAKROOM" and "DVDONME" may also work, and I don't know that they expire - but they will be good only once per credit/debit card)