Voice commands?

Is there an app or a way to do this? I know it sounds kind lame (to some) but I just switched over to the iPhone (love it), but I miss a cheezy feature of my old Krazr phone. I could tap my bluetooth earpiece, say "Call Home" or "Call Lisa" (pun) and it would call based on my phonebook entries. It didn't always work, but in the car, with the phone in your pocket or on the seat, you could call hands free. This is a issue because in NJ you can't talk on a Cell phone while driving unless you have a hands free set up, like a earpiece, integrated car system or on speakerphone.