Sci-Kids: Clear View of a Fog's Details - Explains the difference between a cloud and a fog from a meteorologists viewpoint. - http://www.dailyprogress.com/servlet/Satellite?pagename=RTD/MGArticle/RTD_BasicArticle&c=MGArticle&cid=1031780337823
Hong Kong Observatory: Fog - What fog is, and how it's different from mist. - http://www.hko.gov.hk/education/edu01met/wxphe/ele_foge.htm
Kids Crafts: Make Fog - Has a method to make fog from materials in your house. - http://www.youthonline.ca/crafts/makefog.shtml
Foggy Bottom - Explains that fog is a cloud on the ground, and how it gets there. - http://www.fi.edu/weather/events/fog.html
USAToday.com: Fall Nights Perfect for Forming Fog - Describes why cool nights are good for fog, and links to why cloudy nights are less likely to be foggy. - http://www.usatoday.com/weather/tg/wfallfog/wfallfog.htm