Here's a great idea I came up with so recently that I haven't had time to implement it.
We've got a couple dozen favorite recipes. We've got a cabinet full of spices, so we don't have to worry about those. What I frequently forget, however, are the main ingredients for the recipes. If I want to make Gulf Fish Eugenie, for example, I can't remember if it takes shallots or not.
The solution is simple. Create a Google document for your recipes. Go through your favorites and record only those main ingredients. That way, when you stop at the store on the way home, you know exactly what you need for any one of dozens of great dinners just by looking at the document on your smart phone. No muss, no fuss, no guessing!