Phy.org - Science: Astronomy: Solar System: Planets: Jupiter: Moons: Io

Gish Bar Times: Io Basics - Provides an overview of this moon with links to other resources.
Io During 1999 - Volcanic activity on Io during 1999 as seen from Earth.
Io: Jupiter's Volcanic Moon - Discussion of many geographic and geologic features of Io. Includes links, photo glossary, and a test.
Ionian Web - Provides information, images, maps, scientific articles, links, and the latest news concerning Jupiter's volcanic moon.
Solarviews.com: Io - Statistics, animations and annotated pictures.
The Nine Planets: Io - Overview with data, text, images, links.

Media publications

Galileo's Sharp New pictures of Io Detail Amazing Volcanism - Press release from the University of Arizona. (Published 2000-05-18 00:00:00)
Jupiter's Volcanic Moon Io: Strange Shapes in a Sizzling World - Press release concerning near-infrared images taken by Galileo during its 27th orbit. (Published 2000-10-26 00:00:00)
Scientists Show Jovian Moon Io's Mantle is Similar to Earth - Press release from Washington University in St. Louis. (Published 2000-09-01 00:00:00)