Check out these sources for more information:

An introduction to rainwater harvesting:
http://www.gdrc.org/uem/water/rainwater/introduction.html

Central Texas information from LCRA web site:
http://www.lcra.org/water/save/rainwater.html

Texas A&M website for rainwater issues:
http://rainwaterharvesting.tamu.edu/

Texas Parks and Wildlife Magazine article about rainwater collection and its advantages.
http://www.tpwmagazine.com/archive/2009/july/ed_3/index.phtml

The online rainwater harvesting community:
http://www.harvesth2o.com/

General information concerning rainwater throughout the world:
http://www.rainwaterharvesting.org

Texas Nursery & Landscape Association magazine article about Texas RWH leadership:
http://www.nxtbook.com/nxtbooks/tnla/green_200905/index.php?startid=6#/6

Texas Water Development Board rainwater harvesting manual:
http://www.twdb.state.tx.us/publications/reports/RainwaterHarvestingManual_3rdedition.pdf

Circle of Blue web site for global water issues:
http://www.circleofblue.org/waternews

Steven Solomon's Water Blog Homepage:
http://thewaterblog.wordpress.com