here is some useful tips about the enderdragons:]
snowballs do a lot of damage to enderdragons'though i dont know if you can enchant maybe a sword that does even more damage:]'
the enderdragon egg still has no use even in 1.0.0
the enderdragon egg will be dropped a recourse only if it will be pushed by a piston
on top of each obsidian pillar there's something called an ender crystal which regenerates the enderdragons health if the enderdragon goes near it
the ender crystal can be destroyed by anything in one single hit
the ender crystal makes the same amount of explosion as tnt once destroyed
(this isnt about the enderdragon i know-.-) if you try to sleep in the end your bed will expload

Hope this helped!:D
if atleast one of these taught you something new give me diamonds so that everyone else learns these things to!!!
thankyou!:D