Other
Microbworld: Discover Unseen Life on Earth
Visit this terrific site "to find out all about the world of microbes from your own hands to the mighty Himalayas, landfills to oil spills, common colds to uncommon cures, under microscopes and in the news."
University of California
Ucmp: Introduction to Bacteria
This site provides an introduction to bacteria and examines fossil records, life history and ecology, systematics, and morphology.
Other
Indiana Biolab: The Study of Microbes
This competent site delves into the size of bacteria, shapes of bacteria, arrangement of bacteria, and how and what bacteria eat.
Middle School Science
Middle School Science: Where Can We Find Bacteria?
In this experimental site, you will find out where bacteria hang out and determine what kind of environmental conditions influence bacterial growth. Directions are clear and complete.