The charger that comes with your iPod or iPhone may be free, but it's certainly not as eco-friendly as the Visible Green Charger. So although you probably don't think you need to replace it, you may want to consider it.
Brought to you by Dexim Santom, the Visible Green Charger stops drawing power once your iPhone or iPod is fully charged. This is a particularly responsible piece of technology considering many people leave their devices plugged in over night. It doesn't hurt that it acts as a nifty night light as well.