Potions of Master Thievery, Potions of Perception, and Potions of Power can increase Pickpocket. Master Thievery potions give the highest pickpocket bonus at +40%.
On top of what Flashburn mentioned, I also enjoy handing my thief Potions of Mind Focusing. They increase your Dexterity by 3 which is good for +15% Pick Pocket, among other things.
Ok thats awesome now to see if any of the shops I have access to have any of these, I am about to say hello to Drizz but I wanted to make sure I had all my ducks in a row before "introducing" myself.
I got 1 of each that I needed to get over 50% pickpocket early in the game from high hedge and the temple in the friendly inn. got myself 2 new Scimitars, and then proceeded to beat the crap out of Drizzt.
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