Steve, over the past week, I've checked the codes listed on this site at my local BBX and found that most of them are no longer any good. It'd be nice if you could set up something like insideredbox has, so people could let others know about new codes and if a code is still working or not, especially since the expiration dates on BBX codes are notorious for being inaccurate.
Anyway, here's a list of the codes, copied from your promo page, that aren't working anymore at my local BBX.
Free Rental with code GSNX9X8 – Valid until 11/15/2009 – but still worked as of 12/24/2009!
Free Rental with code G29TA1 – Valid until 12/17/2009
Free Rental with code HOLIDAY – Valid until 12/31/2009
Free Rental with code GV9TA4 – Valid until 1/22/2010
Free Rental with code G211A2 – Valid until 1/29/2010
Free Rental with code GT11A – Valid until 1/31/2010
Free Rental with code TM9SA – Valid until 1/31/2010
Free Rental with code KIOSK – Valid until 2/10/2010
Rent 1 Get 1 for free with code GW9TB2 – Expires 12/15/2009
Rent 1 Get 1 for free with code GW9TB3 – Expires 12/22/2009
Rent 1 Get 1 for free with code DECEMBER – Expires 12/31/2009
Rent 1 Get 1 for free with code GW11B1 – Expires 01/12/2010
Rent 1 Get 1 for free with code GW11B2 – Valid until 1/19/2010
Rent 1 Get 1 for free with code 211B2 – Valid until 2/05/2010
Rent 1 Get 1 for free with code GW12B1 – Valid until 2/8/2010
Free Rental with code BBXPUB
Rent 1 Get 1 for free with code POPCORN