Bonnie mentioned in the lecture on Monday that she also uses leaders/enders for counting. So - say you are working on a project that has 100 blocks and you want to be able to quickly see how many of a unit you have finished. She would send a leader/ender set through after every 10 units for the current project. This allows her to build up the leader/ender blocks more quickly and to see at a glance how many sets of 10 she has completed for the other project.
I need to do a better job of keeping the precut squares nearby so that I don't keep sending the same dust bunny square through. On my list for tomorrow (tonight is lacrosse practice and getting my son packed for 2 camps).
Cheers, K