walters: One thing that can be done to improve access to clean water is to support organizations which are working at this problem (financially or otherwise).
The Mennonite Central Committee (MCC) is an effective organization which is working at this (and many other) issues in developing countries. One particular aspect of how MCC works that I appreciate is that they don't go into a country and set up their own program. Rather, they coordinate and cooperate with people and groups in a country to help achieve common goals. Also, MCC carries out development programs in North America, too (it's not like so-called "first world" countries don't have development problems, too).
I work for PeaceWorks Computer Consulting, which supports several non-governmental organizations (NGOs), including MCC. In supporting these organizations we make use of and contribute to free
software as much as we can, which makes this job doubly-satisfying.
Bash programmable completion is very cool, and it's included in the bash from debian/unstable. I'm addicted.