One in six people on the planet don't have access to clean, safe drinking water.
I didn't find out about this in time to tell you for their Valentine's Day drive, however, you should check out this great site called "charity: water". They have been running a water drive where you can send an e-card for $20 to a loved one which pays for water for someone for 20 years. Your e-card recipient can then choose the country that your donation benefits.
The really super cool thing I like about charity: water is that 100% of their proceeds goes directly to the various water projects they fund.
Really awesome charity.
P.S. I like to put these things into perspective. Let's see $20 bucks for you is about... 5 trips to Starbucks for flavored coffee, 2 or 3 movie tickets (depending what part of the country you're in), or a 2-medium-pizza-deal from Pizza Hut. You could probably do without those one time to get someone water for 20 years. (The pizza, anyway, maybe not the Starbucks!)