Crossing into Quebec
With my daughter at McGill, I have had the great pleasure of doing the border crossing with some regularity. We discovered the always empty crossing at Route 11, Rouses Point, NY. If you are coming from Vermont, as you hit NY, take that first right and you are right there. Don't follow the signs to Rte 15 though, just take the first left and follow that road (a couple of small zigs and zags) and it gets you to Exit 1 on Route 15 as mentioned in Neil's post. (I like google's maps: just put in Rouses Point and you'll get the details.)
We have gotten by the border coming back without any ID for 16 yr old son (though I think I sensed an eyebrow going up), and as mentioned above, a smile and a reasonable travel plan is just about all you need to get into Canada. But they seem to have gotten stricter on wanting the student permits in hand lately.
There is also the NEXUS program. If you give fingerprints, DNA, blood samples, family history, political dossier, voting history, political contribution history, and a few other things (I'm sure I'm a little off on the details) and a few $$$, and submit to the usual background checks, you get a pass which cuts the transit down to no lines at any crossing, a smile, a retina scan, and then the wave. At least that's the way it looked from the line at Lacolle when I was stuck there once.