[rat_melter]

I purchased 6 sets of cheap headphones so I could keep them in all my backpacks/bags/around the house. Anytime I forget to bring headphones to listen to my iPod, I know I have an extra set in my backpack.

I purchased 10 USB chargers that attach magnetically. I keep 2 at the office, 1 in my gaming console, 1 in my computer, 2 in my car, 1 in the wall with an adapter next to my bed and have the other 3 set aside. The metal connectors wear out after a year or two of constant use. I recommend getting the 360 degree ones. I also bought two 3m USB extenders so I can plug in my console peripherals from where I sit while gaming. One for now, one for later just in case. Overall cost of this was ~$60 but it's some of the best money I've ever spent. The convenience is incredible and since all the adapters are the same, they work with all my devices as long as they're not being connected for data transfer reasons.

The best thing I've ever bought that has improved my life, has been an "extra" of anything I find myself using frequently.