Did you know there are that charities collect new or gently used shoes and distribute them to those in need not only in America, but other countries as well? If you have 1 or 2 pairs (or even more!) in good shape that you know you'll never wear again, check out the sites I'm listing below. They'll appreciate you sending them their way!
Soles 4 Souls
The Shoe Bank
Soles United (Collects worn out Crocs)
Donate Your Old Shoes
Shoes for Orphan Souls