Here are some of my favourite and or recommended reading sites for you to enjoy:

http://www.bernerped.com
an online research facility to assist the average pet owner/serious breeder/ enthusiast trace the ancestral roots of their dogs and / or those of others.

http://members.iinet.net.au/~makker/club_website
The Bernese Mountain Dog Club of W.A.

http://www.bmdcsa.com
Bernese Mountain Dog Club of S.A.

http://www.bmdca.org
Bernese Mountain Dog Club of America

http://www.dogzonline.com.au/breeds/breeders/bernese.asp
the Bernese Breeders page on dogzonline

http://www.bernese.tv
The Bernese Breeders Association of Great Britian

http://www.bernergarde.org
Open Database established to collect maintain and disseminate the information about genetic diseases observed in the Bernese Mountain Dog

http://bernesebreeders.org/
The Internet Bernese Mountain Dog Consortium's Pandasite