I Printed-out some cheat sheets with the Hit, Wound, and Crit Tables, and all of the end game pages, like the Injury charts, the Level-Up Charts, The Search Chart, Wyrd Stone Selling chart, what multiples on searches give you, etc...
I also printed-out the Warband Option List and Speical Rules, i.e. Hero Options, Henchmen Options, and Spells, but I keep that with my Warband list, paper clipped to the back.
It's like a small packet that is about 20 to 30 pages (most is the multiples on searchs). It is a lot quicker then waiting for the book, or flipping through the entire book to find what you are looking for.
I keep it in a pocket folder that I take with me.