I'm just reposting this from a lonnnnnggg time ago, but it's still valid and so great for those of you who just want a couple of coupons from the entertainment book.
http://www.entertainment.com/saversguide/sbc/search
Apparently though, it only worked for certain random IP address. You should see a form to fill in your address (only need to put in postal code) to search for discounts. If not, try to find "forgotten password?" or use someone else's computer.
I just used a 2 for 1 IMAX ticket. Lots of 2 for 1 or restaurant deals!