I crossed the border twice, both in Montana (went into Waterton, then into Banff), and had no problems. This was a couple of weeks ago (July/Aug. 2010). They asked if I had any fruit, where I was going and for how long, and that was about it. When I came back the first time they asked if I had purchased anything, I said a few books, they waved me on through, the second time they didn't even ask. I also had dogs with me and the first time they wanted to see their rabies certificates, the second time he didn't ask for anything. These were not the same people, so they didn't remember me, different crossings. It was very easy going both into and out of the U.S. They didn't ask for my driver's license
, just my passport, nor car registration
or proof of insurance. My SUV was packed to the gills with camping gear and I had a roof carrier and maybe it looked too intimidating to search me, but they were opening the back doors of other vehicles, etc. Maybe my dogs look like trouble, LOL.
I used U.S. money and had no problems, but the exchange rate was 1 to 1. Funny, as the Canadian money I brought back isn't accepted by anyone here.