the same thing i have always used that portion of the dock for, readily needed documents for current projects. it's like asking what you use your desktop for. stacks reduce clutter on your desktop, and let's be honest, many many many people save everything to their desktop for some insanely dumb reason. anyways...moving on, i have a new project i am working on weekly and will just drop its folder in the dock for quick access. next week, something new.