Well I'm looking for a way to do it like my wife has on her 4S. I had it on my first Droid and loved it...just not ready for an upgrade to the 4S right now. Will wait for the next iPhone.
I've used several tweaks with Dragon on my iPhone 4 that do help get that speech to text when I'm driving or busy with my hands.. but nothing as cool as Siri on the 4s. Having to copy and paste, and actually open two or three apps to make it happen