Royal Society of Chemistry
Visual Elements: Berkelium
Nice summary of the basic facts known about berkelium. Easy to follow.
Encyclopedia of Earth
Encyclopedia of Earth: Berkelium
Information about the element, Berkelium, atomic number 97. Covers physical properties, atomic properties, how abundant it is on the Earth, and details about health-related regulations.
Chemicool
Chemicool: Berkelium
This site provides basic information and physical data on berkelium, all arranged in an easy to follow, clear manner.
Environmental Chemistry
Environmental chemistry.com: Periodic Table Berkelium
A nice summary of the chemical and physical properties of berkelium as well as additional information. Very nicely done and helpful.
Other
Contributors to Discoveries of the Actinide Series
This page provides information about Stanley G. Thompson and Glenn T. Seaborg, both of whom contributed to the discovery of berkelium and californium of the actinide series. Very comprehensive site.
Web Elements
Web Elements Periodic Table: Berkelium
Basic information on berkelium, including radioisotopes and electron configurations. Includes audio content.
Other
Lanl: The Actinide Research Quarterly
This is "The Actinide Research Quarterly", a publication about current research of the actinide metals and nuclear materials technology by Los Alamos National Laboratory. Very detailed information.