Beilstein/Gmelin - http://chemistry.library.wisc.edu/beilstein/ , also
https://www.discoverygate.com/iss/servlet/App?Action=ShowApp 

BELIT, [bioethics literature database] - http://www.drze.de/BELIT 

Bibliography of Asian studies - http://www.aasianst.org/bassub.htm 

bibliography of fossil vertebrates - http://www.bfvol.org , also
http://www.vertpaleo.org/publications/bibliography.cfm 

BIND, the biomolecular interaction network database - http://www.bind.ca, also
http://bond.unleashedinformatics.com/Action

BioEngineering abstracts - http://www.csa.com/factsheets/bioengineering-set-c.php  

Biography and genealogy master index -
http://www.ancestry.com/search/rectype/biohist/bgmi/main.htm

Biological & agricultural index - http://www.ovid.com/site/catalog/DataBase/169.jsp

Biological sciences - http://www.csa.com/factsheets/biolclust-set-c.php

Biology digest - http://www.csa.com/factsheets/biodig-set-c.php

BIOSIS previews -ISI Web of Knowledge-
http://www.isiwebofknowledge.com/

Biotechnology & bioengineering abstracts -
http://www.csa.com/factsheets/biotclust-set-c.php

Birds of North America Online - http://bna.birds.cornell.edu/bna

BL Online - http://www.blonline.nl/ 

Braille book review, or, Talking book topics - 
http://www.chipublib.org/003cpl/irlbph/cpltbc.html

Britannica online - http://www.britannica.com/ 

Business of baseball - http://www.businessofbaseball.com

Business source premier - http://connection.ebscohost.com/content/ , also http://www.uwe.ac.uk/library/resources/general/databases/titles/bsp.htm