Eggs last a while, but not forever. If you need to preserve yours a little longer, you can stick them in the freezer. Of course, you don't want to just toss them in, shells and all. That's where an ice cube tray can help.
WonderHowTo writer Karen Ahn explains:
Use ice cube trays to hold each egg. You can also freeze separated egg whites and yolks if you have any leftover from baking. Just be sure to label how many egg whites and yolks are in each container.
Also make sure not to freeze eggs too close to their expiration date. If they're about to go, freezing them won't make them edible for too much longer.
Your Freezer: You're Using That Wrong, Too [WonderHowTo]