Another headcount for PlayPumps! I just clicked. Great site, I hadn't seen GlobalGiving before. I'll definitely be going back.
If you're interested in water delivery issues, for places that don't have suitable boreholes, you might also look at the Hippo Water Roller:
http://www.hipporoller.org/And here's a detailed set of responses on the benefits and challenges of the Hippo project:
http://www.changemakers.net/node/6924One of the things they didn't mention in the Changemakers review is that people in militarized areas have found a great positive side effect: if you have to walk through a minefield to get your water, rolling across it with 90 liters of water instead of your foot makes a big difference. In addition to saving lives, it's letting the people walk faster through dangerous areas, reducing water-fetching time even further.