When endermen die, they don't always drop their block.

I didn't know that they ever really did drop the block back. Huh.

@Eric: They sometimes place it to the ground when they die. May be intended they don't drop it tho.

I think they sometimes pick up blocks or place them, especially when damaged. I thought it was an item drop that you were talking about. =) I think that it would be a good feature for the game (if you have a beacon and an enderman steals a block, it's pretty bad) but I don't know. Thanks for the response!

afaik they only steal natural blocks (whose got generated by the game), no blocks placed by players

Ok, thanks for the fact check. =)

@Eric: o well, not quite: http://www.minecraftwiki.net/wiki/Enderman#Moving_blocks

They can only pick up a few blocks tho, grass, dirt, mycelium, sand, gravel, clay, flowers and mushrooms, cactus, melon, pumpkin, and tnt. So no risk of losing a diamond block, but I won't store my Tnt outside next to my redstone area anymore... =P

Well, that was a fast response from a Moderator. If he is reading this, Thanks!