http://earthobservatory.nasa.gov/Library/Water/   Includes stats on distribution of water in different formations.
http://www.naturegrid.org.uk/rivers/watercyclepages/watercycle-intro.html
http://www.teachtsp.com/products/productextras/SCISCI/watercycle.html
http://earthguide.ucsd.edu/earthguide/diagrams/watercycle/index.html
http://www.epa.gov/safewater/kids/flash/flash_watercycle.html

http://ga.water.usgs.gov/edu/watercyclecondensation.html