i find myself using it at least once per day
Can't vote in your poll.
My girlfriend and I make a video call about 3 times a day
never. it is a useless feature that amuses way too many people, even though in practicality it will rarely be used.
I can imagine usage going up when Apple flips the switch on 3G network use in the near future.
I haven't even tested it yet. It's a really cool feature, but I really can't think of a circumstance where I'd want to video chat. ...maybe with your children when you're out of town...
I've used it 4 times in the last 7 days, but I can say for certainty that I'd use it a LOT more if I had more wifi and if I knew more people with iPhone 4s. (It's just my wife, so far.)
I could honestly see myself using it 4 or 5 times a day if I had the chance. But we don't live in that world yet.
You've used it less than zero times?