There are a number of websites devoted to Beaver Scouting, and related activities:
 

ScoutBase UK - Beaver Pages
http://www.scoutbase.org.uk/6to25/beaver/

Scouts UK - Beaver Pages
http://www.scouts.org.uk/beavers/

History of Beavers
http://www.scoutbase.org.uk/library/history/beavers/

The Beaver animal
http://www.beaversww.org/