Water Structure and Properties Very useful site by London South Bank University
Water Science for Schools US Geological Survey's water science site.
Water FAQs Answered by Lenntech, a dutch water treatment organisation.
Water - The Marvellous Molecule (Radio) A BBC World Service series. Listen to all three programmes here.
Snowflakes Everything you ever wanted to know about them, plus some fantastic snow crystal photos.
Water on The Web helps college and high school students understand and solve real-world environmental problems using advanced technology (US site)
Water Science Forum Royal Society of Chemistry subject group focusing on the application of chemical sciences in water treatment, disposal of wastewater and the impact of these activities on the environment.