This is a great tip for hard boiling eggs and minimizing the mess that can result from an egg cracking during the boiling process. (Don't you just hate that???) In fact, it salvages the cracked egg(s) so that they are also perfectly boiled and usable, you just have to use them a little sooner than later. It's also the perfect hard boiled egg recipe.

For best results, let your eggs come to room temperature before boiling.

Place the eggs in a heavy pot and fill with hot tap water until the eggs are covered by 1 inch (at least) of water.

Place pot on burner and liberally sprinkle each egg with table salt.

Turn burner on to high until the water reaches a rolling boil for 3 minutes.

Here you can see a video of an egg that cracked in the boiling process that was coated with salt:
http://historicvalentownmuseum.org/mediagallery/mediaobjects/orig/5/5_gedc0403.mov

Turn off burner and remove eggs from burner. Let eggs sit in hot water 12-15 minutes.
Cracked egg in cooling off mode:


Pour out the old water and fill the pot back up with really cold water. Let eggs sit in cold water until cool to the touch, another 5-10 minutes, then refrigerate as usual.
Cracked egg ready for refrigeration and use.