Do the "bunny ears" way of tying your shoes but loop both "ears" through. Presto, a knot that won't work its way undone and you can usually tell when you step on a lace because there's so much resistance.
>>miniki+q5
Indeed. I use the Ian knot normally, but if I were to be doing something like hiking or ice skating, I'll use that variation. It never comes undone.