Posted By:
MWWarshawlaw --
Isn't it ironic that the most lenient graders put their cards in the most indestructible holders?
My technique involves "sawing" the edge near one of the corners and then gently prying all the way around the holder. My tool of choice is the leatherman (specifically, the "wave" model -- it's got the best variety of cutting and prying implements).
Here's the link to the website:
http://www.leatherman.com/products/tools/default.asp