What is La Niña? - Illustrated explanation with realtime graphics and animations of data. Also numerous links to references. From NOAA.La Niña weakening, but only slowly - Article from explorezone.com showing the diminishing effects of the La Niña system.
FEMA -- El Niño Section - Preparedness and general information.
La Nina Hangs On - Article from the JPL El Niño/La Niña watch.
What is an El Niño? - Illustrated explanation with realtime graphics and animations of data from the tropical Pacific Ocean. From NOAA.
La Niña - The evil sister of El Niño - Informative site on La Niña and El Niño covers explanation of the systems, prediction/forecasting, and future effects of these phenomena.
The Potential Use and Misuse of El Niño Information - A workshop report from the Environmental and Social Impacts Group. Includes compilation of documents including an executive summary and a glossary.
CPC - La Niña Coverage - Regularly updated discussion and coverage of the La Niña weather system including global and regional impacts and forecasting.
CPC El Niño/Southern Oscillation (ENSO) - Coverage of the 1997/98 El Niño weather system from the Climate Prediction Centre, including forecasts, historical info, and the impact of the system on weather patterns.
El Niño and La Niña - National Academies article traces the basic scientific research that led to our current understanding of these weather phenomenon.