The secret weapon — a set of baskets and a tray that you use for very specific cleaning and tidying purposes — was proposed by Khat:
Use a tray if you're snacking anywhere but the kitchen — it keeps all your dishes corralled & makes it easier to get them back to the kitchen.
Use a basket: if you tend to leave a trail of books, pens, notebooks (or electronic tablets), cell phones, chargers, nail polish, cat brushes & many etceteras where ever you go, start carrying them in a handled basket.
Use a basket II: I love picnic baskets, the ones with lids. I have one in almost every room & toss all the clutter into them at least once a day. Nothing gets lost, everything's out of sight, carry it around to put things away.
Use a basket III: laundry baskets! When you're doing housecleaning, toss your cleaning supplies into one & carry it around with you. Toss anything that's out of its place into the basket & put it away as you go. Use them when gardening, too — hose it out when you're done.