I've been wonding about this. I've got Fulcrum 7's with Vittoria tires and they are a pain to get mounted. even with the tire inflated a bit, I find it a bit hard not to pinch the tube. I kinda thought it was the tire, didn't realize the rim might make a big difference.
I've got the fold up Hutchinson tires on my old Mavic rims that are a dream to put on. No tire levers needed.