Where can I find it again? I can't continue without it. (I'm still loving the game though :P)
Also, is anyone else experiencing massive memory leaks?

My specs are:

Gigabyte GTX 460 1GB OC @800/1700/2000
AMD Phenom II X3 720 @2.8Ghz
4GB DDR3 RAM 1066MHZ
1TB Hitachi 7200RPM HDD

When you move area it gets put into your inventory. You open that up with '['