Discussion Groups or Lists on alpine plants (exchange of ideas, questions, answers...); these are free of charge :

-in French,
to subscribe, send an e-mail to :
http://plantes-passion.forumactif.fr

-in English, Alpine-L . To subscribe to this list, whose membership is already close to a thousand and includes some of the most famous people in the alpine gardening, click here : http://listserv.surfnet.nl/archives/alpine-l.html and follow the instructions,

or visit theAlpine-L's website : http://www.thealpinegarden.com/alpine-l.htm
Subscription is easy from there.

A "must" to visit, Alan Grainger's website: The Alpine Garden

The website of Gérard Dumont is dedicated to sempervivums (jovibarbas): http://perso.wanadoo.fr/gerard .dumont/

 

Visit the website of Dutch Rockgarden Society (Nederlandse Rostplanten Werkgroep) : http://www.rotsplantenvereniging.nl/indexe.htm 

The website of Flora Europea : http://utopia.knoware.nl/users/aart/index.html