Redbox is offering a free DVD Rental at all RedBox locations today only (Monday, October 20th). Looks like a great way to try out Redbox if you have spare time to watch a movie on a Monday night. To get your free rental, type in Promotional code PK66H8.
If you're not familar with the Redbox DVD Rental Kiosks, check out my Redbox DVD Kiosk review from last year. Basically you can rent a DVD (no blu-ray yet) for a buck a day.