What Simple Gadget Has Made Your Life a Bajillion Times Easier?

We're all looking for something that can solve every one of our problems. Unfortunately that's probably a futile effort. Chances are though, there are cheap, easy solutions to at least one of the annoyances each of us run into every day, it's just a matter of figuring out what the hell they are.

So lets collect all our wisdom, and see if we can't come up with a list of cheap, simple solutions to the most irritating problems we all hate. What's your secret little ace in the hole that makes life so much easier that it's worth its weight in gold?