Originally Posted by Harmony

I have a cool little gizmo that helps. It's a large square with slots cut every half inch. You just put your cutter at the bottom and run it up to the top. What's great about it is that you always cut straight, but then you don't have to reposition your ruler after the first cut--you just move your cutter over to the next slot. This thing is one of my favorite tools, and makes cutting strips a breeze.