I'll second Matt's recommendation for a side-cutting opener. Kuhn Rikon makes them as well and if you get the stainless version, there's no chance whatsoever that you or anyone else will ever break it. http://www.bigkitchen.com/product/Kuhn-R...and_Jar_Openers

As Matt also mentioned, the blade will get dull over time. But mine is 10 years old and still usable.