I enabled letsencrypt for brie.com today. Turns out for www and non-www, you have to give it the -d option for the www.brie.com and the -d option for the non-www domain. It works now for both. Yay for letsencrypt.
As root, do the following on Debian Squeeze.
# certbot --authenticator standalone --installer apache \ -d brie.com -d www.brie.com --pre-hook "service apache2 stop" --post-hook "service apache2 start"