I've never heard of the coke method either. Interesting...
I LOVE LOVE LOVE my crockpot. It is a gift we got on our wedding, and is just so handy. I just dump whatever I want to cook into it and leave the house. By evening, everything is ready. I've found that whatever I cook in the crock pot ends up so tender that if I try to lift it, it would break...so I'm not sure if its the coke or the crock pot, or both. :D I usually use a little vinegar in my meat marination. Its an excellent tenderizer.