FAS.org: Cluster Bombs
Offers extensive information on types, usage, and specifications. Also includes photos.
Human Rights Watch Backgrounder: Cluster Bombs in Afghanistan
Call for a global moratorium on the use of cluster bombs due to their wide dispersal patterns and reported roles in civilian casualties. Also provides information on CBU-87 and other cluster bombs, and reports on their use in Afghanistan.
BBC News: Cluster Bombs
Notes on the controversial weapons consisting of a canister which breaks apart to release a large number of small bombs.