In mourning the passing of John Paul II, one beautiful way to uphold his memory would be to contribute to a cause close to his heart, aiding the poor. Organizations that have done so over the long haul include Bread for the World, which lobbies to end hunger in the U.S. and abroad, as well as educates the public on causes of hunger, and ways to end it.
Another, Save the Children, helps in a variety of ways, such as increasing economic opportunities via micro-enterprise programs, to help women start small businesses, and in building strong local micro-finance institutions to continue economic growth in their communities.
Of course, you can help closer to home. Local food banks welcome donations of both food and funds; unfortunately, an increasing number of the people who receive services from food banks are working people, so the impact of a gift to such an institution would be immediate.
Then Jesus said to his host, "When you give a luncheon or dinner, do not invite your friends, your brothers or relatives, or your rich neighbors; if you do, they may invite you back and so you will be repaid. But when you give a banquet, invite the poor, the crippled, the lame, the blind, and you will be blessed. Although they cannot repay you, you will be repaid at the resurrection of the righteous." (Luke 14: 12-14)