Eye of Ender

Eye of Ender is a one-use item the player can create to repair an Air Portal Frame block which are found naturally in Strongholds.

As shown by Jeb in his livestream, it can also be thrown, acting as a guide to locate the Air Portal Frame found within Strongholds. There is a chance that it will disappear after being thrown, "returning to the Ender." However this is likely a future addition as the ability to throw has not been yet been added to Pre-Release 3.

Crafting
An Eye of Ender is produced when a Blaze Powder and an Ender Pearl are crafted together.

History
It was first added in Beta 1.9 Pre-release 3.

Trivia

 * This item doesn't resemble an enderman's eye. Their eyes are purple and their pupils are blank-looking. It appears to be a reptile eye, and is quite likely to be a Enderdragon eye.