At an organization workshop I once attended, there was one really good tip: Buy one of those oblong crates that suspend hanging folders. Label the folders Mon, Tues, Wed, etc, and subject labels. When you make copies ahead put them in the folder for the day you've planned to use them. If no day is yet assigned for the task, use the subject folders. You could also have folders for general topics such as graphic org, committees, forms to be completed, etc.
I'm a piler too yet this one idea is very useful to me. Good luck!!