I was reading about this earlier as I had the same thing with my V3x. Motorola have gone a stage further than normal with the voice dialling with their new phones and the voice dialling now works like this...
Say for example you had someone in your phone book as "Michael" and you want to voice dial them.
You don't have to store a voice tag, all you have to do is voice dial "Michael" and it will look through your phone book to see someone entered as "Michael" and dial them!!!
Even better than that, if it finds some names that sound similar then it will ask you which one you want by showing them all on the screen and reading them out to you
For example Dave, Fabe and Jane sound a bit similar so if I say "Dave" then the phone comes up with those 3 names. I can either select one on the screen or literally tell it which one I want
It also has "digit dial" where you can literally tell it a number and it will dial it!!
Great stuff!