Overfitting: The Eternal Struggle

Man, this overfitting discussion is hitting home for a lot of us, myself included. I've spent countless hours optimizing a strategy only to see it crumble in live trading. It feels like a constant battle to find that sweet spot between fitting the past and performing in the future. What are some of your most effective, non-obvious methods for keeping your strategies robust and avoiding that dreaded curve-fitting? I'm always looking for new perspectives on this.