Stop P-I-L-I-N-G!
Quite simply put, piles are the result of either delayed decisions or delayed actions! If you want to avoid pile build up of papers, tasks, emails, etc then start making decisions on how to handle the information the first time you come across it. How many times have you looked through your mail whether paper or electronic only to just take a look and then leave the pile for another time? Problem is the pile will grow as you repeat this process every day until you feel a sense of overwhelm. Making decisions and taking action based on those decisions will give you a sense of control and alleviate those annoying piles!