If you can give, now is the time. Save the Children is a great cause. And their Valentine's Day cards get kids involved in helping kids. From savethechildren.org:
Your Favorite Valentine's Day Cards
Help us make a difference for children in need by ordering our special Valentine's Day cards for your kids. Enjoy the wonderful new cards created by talented contemporary artists and friends of Julianne Moore who volunteered to help. Or choose our traditional set of Valentine cards featuring artwork created by children ages 11-17 from across the country.