Well I havent seen this posted anywhere here so I thought I'd share it with ya. This works when there are server restarts only; que up for a bg and make sure it last till the 7 minute mark on the restart timer; this is when blizz kicks everyone out of the bg. Doing this i discovered that after I left the bg I still had preparation! It lasts til you die and can even log out of wow and still have when you come back in. This is great for a lot of things considering all your spells are free and youll have infinite mana. Again I'm sorry if this is a repost. Hope you guys like it, I know I do. I did this friday morning and still have it; heres the armory of one of my alts who has it still : The World of Warcraft Armory
As you can see in the top right preparation is still on me.