What do you get from mobs on minecraft?

Zombies drop rotten flesh, which can be eaten to restore hunger in dire situations.

The below answer is outdated, but I will leave it here for the sake of internet history:

Zombies only drop feathers. No more than 3 at once.

Since they were one of the first mobs created, Notch said that he didn't know what they should drop. Chickens didn't exist at the time, so feathers seemed

like a great idea.

Don't kill zombies for their drops. They're generally considered the least productive

mob to kill for loot. Maybe this will change in the future.