Informal:

Bugs in the News by Jack Brown (Microbiology, U. Kansas).

Professional Development

Colorful Graphics:

CELLS Alive!
Computer Visualizations of Viruses.

Unique Organization:

Access Excellence (from Genentech).
Bugs on the Web (from Northern Alberta's Microbiology and Public Health)
Index Virum (Australian National U.)
Murray - a British bacterium with an identity crisis.
The Microbe Zoo.
The Tree of Life Root Page.

On-Line Courses:

ASM Microbiology Education Links 
An Introduction to Molecular Virology (U. Cape Town, S.A.).
General Virology Teaching Materials (U. Rochester).
Medical Bacteriology (Queen Mary Westfield College, U.K.)
NetBiochem (Hahnemann).
Primer on Molecular Genetics (DOE).
Structural Virology and Targeted Drug Design (U. Wisc.).
The MIT Biology 7.001 Hypertextbook.
Tom Terry's "Fundamentals of Microbiology" (U. Conn.)

Good Collections of Web Pointers:

MedWeb: Microbiology and Virology (Emory).
Microbiology list (Yahoo).
Raymond Lin's Medical Microbiology Home Page (Singapore).
The E. coli Index (U. Birmingham, U.K.)
The Microbial Underground (Queen Mary Westfield College, U.K.)
World Wide Web Server for Virology (U. Wisc.).
WWW Virology Servers (Tulane).
WWW Virtual Library: Immunology (Harvard).
WWW Virtual Library: Microbiology and Virology (Harvard).
All The Virology on the WWW

Organizations:

American Society for Microbiology (ASM).
American Society for Virology (ASV).
American Association of Immunologists (AAI)
Centers for Disease Control (CDC)
The Helicobacter Foundation
National Institutes of Health (NIH)
World Health Organization (WHO).
Association of Medical School Microbiology and Immunology Chairs (AMSMIC)

Microbiology/Immunology Departments:

Department of Immunology, Washington U.
Department of Medical Microbiology and Immunology, University of Alberta
Department of Microbiology, University of Kansas
Department of Microbiology and Immunology, U. of Rochester
Microbiology Department, University of Cape Town, S.A.
Microbiology Institutes list (Yahoo)
Virology Institutes list (Yahoo) 

Funding Resources:

NIAID Home Page
NIAID Program Announcements
Search NIH Grant Database

Raw/Research Resources:

DNA Vaccine Web
Foodborne Pathogens & Natural Toxins (FDA)
Human Papillomaviruses Database (Los Alamos)
MedScape
The National Center for Biotechnology Information 
Nature (London)
Science (AAAS)
Steve Dewhurst's list of Resources for Research
The Molecular Biologist's Desk Reference (NIH)
The Parasitology Resources Page (Pasteur Institute, France)
USENET newsgroup: bionet.microbiology