We've all been there -- you go out Friday night, get a few drinks in you, and suddenly calling up your former friend, or a girl you're trying to ask out, or a girl you used to go out with (who decided not to hang out with you any more thanks to all the drinking) becomes something you're suprisingly willing to do. BDB, however, will say no, and keep that contact out of the contact list, until whatever time you'd said it was OK to let it back in. And, presumably, by that time you can be in a more sober state of mind, and realize that you don't need any girl whose idea of a good time is keeping you from having fun. Take that, Susan!
It's helpful for sure. All the program seems to do is erase (and rewrite) whatever contacts you choose in your address book, so you've got to re-open the program after the set time if you want your contacts back. Also, the app doesn't actually block the phone, just the contacts you choose, so if you have their phone number memorized, you might still end up doing a little drunk dialing. But you never know -- BDB might be just the thing to help you leave that old relationship right where it is, or at least come to your senses long enough to not sabotage that new one. It's in the App Store right now for 99 cents.