I have to agree - leave the chalk home! Most of the lines are actually moving most if not all of the time. There would not be time to use the chalk and I imagine the lil ones would be stepped on.
To tell the truth I have never had to actually bring anything special for lines or even think much about what to do in line. We have been visiting since my girls were 1 and 3 and by using a combination of emh and fp you really can reduce any amount of waiting. If we do hit a line we just talk, joke around and take in the sights. We have also met some great friends, young and young at heart, in line.
My girls like pal mickey, he tells corney jokes and is great for giving little known facts in the parks. He occasionally will give tips as to a ride with little to no wait time or when a parade is about to start.
My girls share one and its really a fun toy. They take turns "wearing" him on a water bottle strap.
TJ