I've seen a lot of bras in my lifetime, but none like this Maidenform Breakthrough Backless Bra ($25).
A lot of bras claim to be backless, but this first-ever design is a completely backless bra. So your first question is, "How does it stay put?" Well, there's silicone on the wire channeling to prevent slippage. The seamless foam cups provide a natural shape, so this is probably not a good option for those who seek major cleavage. This bra will put an end to the issues we face when wearing an open-back dress . . . finally!
On a side note, doesn't the model look like actress Teri Hatcher?