Bat Conservation International
Comprehensive site with lots of information about bats and their conservation, including audio clips of bat echolocation calls.

Bat-Watching Page
Information on bat-viewing locations in the US and links to other sites about bats.

Bat World Sanctuary and Educational Center
This site has lots of info about the activities of the rehabilitation center as well as information about the natural history of bats.

Flying Fox
A brief introduction to the flying fox, the Australian and Southeast Asian big cousin of bats.

Gallery of Bats
Excellent photo gallery of bats from the California Bat and Conservation Fund.

Meet Some Bats Page
Detailed information on a wide variety of bat species from the Organization for Bat Conservation.