The following are Pelargonium Websites with information about pelargoniums:-
http://www.thepags.org.uk/
http://thepelargoniumregister.com - the place to check information about a particular pelargonium - now with photographs being added.
http://www.geraniaceae-group.org/
http://geraniumpage.com/ - An awesome website with loads of information and some amazing photographs.
http://www.southaussiepellies.org/
http://ligaspelargoniums.blogspot.co.uk/
http://www.malarpelargoner.se (In Swedish, but paste URL into Google Translate)
http://www.alltompelargoner.se/ Facebook page of Lena Lundquist - Swedish pelargonium hybridiser
http://www.gapswa.org.au/
http://www.geraniumsonline.com/
http://www.zonal-geraniums.ansbrook.co.uk/
http://www.somersetfuchsia.org.uk (website of the Somerset Fuchsia & Pelargonium Society)
https://sites.google.com/site/cotswoldfandp/home/about (website of the Cotswold Fuchsia & Pelargonium Society)
http://pelargonium-club.com/
http://www.internationalgeraniumsociety.com/
http://geraniaceae.com/bin/welcome.cgi (This is the website of Geraniaceae, a small nursery in California specialising in hardy Geraniums and Angel Pelargoniums)
http://www.grona-sidorna.se/
http://freespace.virgin.net/peter.waving/peter.waving/index.htm/PelliesFrame1Source1.htm
http://pelargonia.de/index.php Website of Dieter & Brigitte Stisser. Some beautiful photographs of pelargoniums - species and zonal. In German but easily translated with Google Translate.
http://eioganson.livejournal.com/ Elena's Blog about Species Pelargoniums - with some fantastic photographs. In Russian but easily translated with Google Translate)
http://www.flowernamesofheirloomgardenplants.com/perennial-geranium.html
Please email me if you know of any other pelargonium websites