I found the best idea in my Real Simple magazine for cutting corn kernels off the cob. Stick the ear of corn thin end down into the tube of an angel food cake pan or bundt cake pan so that it's standing upright then run your knife down the cob. The corn cob doesn't move as you're trying to slice the kernels off and the kernels fall directly into the pan.
We tried this tonight with our leftover corn. It worked so well! I then scooped the kernels into a freezer container and popped the container in the freezer.