Cloud Links:
http://www.chitambo.com/clouds/ (A great site to introduce clouds)
http://vortex.plymouth.edu/clouds.html (Plymouth State College Meteorology Program cloud boutique)
http://www.ozthunder.com/photo/clouds.htm (An introduction to clouds)
http://www.atmos.washington.edu/gcg/Atlas/ (Univ. of Washington Houze's cloud atlas)
http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/cldtyp/home.rxml (Cloud types and classifications)
http://www.bsch.au.com/photos/index.shtml (Lots of cloud and weather images)
http://www.wolkenatlas.de/ (A cloud atlas in German)
http://www.islandnet.com/%7Esee/weather/eyes/cloudatlas.htm (A simple introduction to clouds)
http://www.lightningphotography.com/links.html (A comprehensive list of weather photo and phenomena links)
http://www.australiasevereweather.com/photography/ (Australian Weather Photography)
http://www.capetownskies.com/clouds.htm (Gordo's cloud gallery and others)
http://www.etsimo.uniovi.es/solar/portug/cloud1.htm#views (Images of clouds and weather systems from space)
http://lasp.colorado.edu/ (Noctilucent cloud pictures)
http://www.weatherpictures.nl/lightning.html (Lightning pictures)