Today you can get a free movie rental from Redbox with code EA5636. If you are intrested you can sign up to recieve the Redbox newsletter and they will send you a code for another free rental. While on their site you can also sing up to have Monday's free movie rental code sent to you in a text message. During the month of May you will also recieve a free movie rental code on Wednesday.
That's all I've got right now but I will come back and update with more freebies as I find them.