YESSSSSS! With my humongous charts, I like to make a copy to cut into smaller pieces to pin to my fabric. Now that I have a copy machine, I don't have to make a trip downtown ... if I feel like starting something new at midnight, I can do it.
My other favorites are the new 2.5 gallon ziploc bags for kitting up into and my mini Swiss Army knife -- sharp-pointed little scissors, and with a rubber band through the key ring, you can affix it to your wrist so you don't have to hunt for your scissor (and won't lose it while running from the bus to the train).
Stitching on the go, I have an empty 35mm film canister with me to hold my orts.