Getting ready for a move can be a perfect time to go through and get rid of stuff if you feel like you have too much of it. You can decide what to keep, donate or find a creative use for (which I try to also do).
Getting rid of stuff before you move will also make moving easier, obviously because you will have less to move.
Donating is a great option for your unwanted items but you could also try a garage sale or selling your stuff on eBay or Craigslist.
Throwing out unwanted items is always my last resort, especially these days, when there are so many other environmentally friendly options.