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I whole heartedly support this! I recently lost 41 levels due to a world hole, so anything that prevents the loss of exp when you save it up will be brilliant!

XP potions are in in the new release, no?

You mean the 'Bottle o' enchanting'? http://www.minecraftwiki.net/wiki/Bottl ... Enchanting.
That is only available in creative mode, and it is meant to be a reward for players on a server. Because of the ability to have a Infinite experience bar in creative, you won't need the bottles.

It would be cool to make a maze with these potions. Each round you win, you get one more experience level.

That is very disappointing. I suppose it would be a nice tiny reward to give out a spawned bottle with 1-3 xp, but not something we really have a need for atm. I guess we need to look elsewhere for an xp storage solution >.<

The only way I can see this being very useful would be having mobs drop them instead of floaty xp bubbles.

I implemented this a couple days ago. Monsters now drop an XP bottle, that you can sell or use as you please.

They'll probably be pretty expensive at first.