World Sunlight Map
This gives you a view of where the sun is shining light on the earth. There is a flat rectangular view as well as a hemispherical view. Very cool.
http://www.opentopia.com/sunlightmaprect.html
UV levels
This is for Australians and provides an indication of expected UV levels in Australia. The link below is for Melbourne, Victoria.
http://www.bom.gov.au/vic/uv/melbourne.shtml
BOM - Weather radar
This is the Bureau of Meterology's weather radar which provides an indication of rain fall, where it is hitting and how much. Useful in this week for the recent heavy raining in Melbourne. You can view all of Australia (national view) or just one state, the link below is of Melbourne, Victoria.
http://www.bom.gov.au/products/IDR021.loop.shtml#skip