Here's another excellent article on the world's water problems:
Humanity Has Got to Come to Grips with the World's Fresh Water Crisis
I don't know why desalinization is never mentioned, but I think it's easy to see that it's the best long term solution in town.
The world is what, 80% water?
Sure, it's salt water, but that's by no means at all insurmountable. Look at Saudi Arabia and other places that use desalinization plants.
Yes, it would take a major project, but with our unemployment rate, don't you think that makes the idea even better? Wouldn't it be nice if a million people where involved in making desalinization happen? Sounds like win-win to me.