Helpful Cleanup Hint: "Putting things back in their homes". Here at our house, we refer to cleaning up as "putting things back in their homes". It is useful here at home, as well as at the store, anywhere really! I've found kids of all ages, especially toddlers, are WAY more responsive and willing to "put something back in it's home" than simply "putting it back" or "cleaning it up".
Discipline Tip: When things start getting hairy/loud/tantrumy or otherwise out of control, I've found the best way to regain control is to turn my voice way down - in tenor, as well as volume...That helped me a lot in managing numerous preschool classes, as well as my own children, over the years. I read once, "let them borrow your calm when they need it most," and that helps me to remember how important it is.
To help combat the effects (and you know there MUST be effects) of all the over-the-top flashy, noisy kids' toys and games, remember that teaching and modeling the art of focus and quiet observation is more important than ever...take the chance whenever you can.