I just had an amazing yet simple idea that I am surprised is not in the game.
Okay so I'm sure everyone, just like me, is tired of losing all of their xp just because you are saving it up or don't feel like using it. You rack it all up and for what? To enchant things yourself. Well some people like to buy enchanted tools off of other people correct? In the creative menu there is a bottle of xp. This item is only obtainable by cheating (creative mode).
Wouldn't it be cool if Jeb made it so that you could store your xp in a bottle? Maybe make some kind of magic diamond bottle that lets you store your experience orbs in it. That way you can sell of experience to other players or keep them stowed away for when you need them in a safe place!
Anyways was playing the new snapshot and the idea hit me, just thought I'd share it.