A Brief Introduction to Graphical Models and Bayesian Networks 
Kevin Murphy's tutorial, including a recommended reading list.
Association for Uncertainty in Artificial Intelligence 
Main association for belief network researchers. Runs the annual Uncertainty in Artificial Intelligence (UAI) conferences, and the UAI mailing list.
Bayesian Network Repository 
Maintained by Gal Elidan - over a dozen publicly available networks with documentation, in several popular interchange formats
B-Course - Dependence and classification modeling 
A free, interactive tutorial on Bayesian modeling, in particular dependence and classification modeling.
Belief Networks and Variational Methods : Amos Storkey 
Dynamic Trees are mixtures of tree structured belief networks, and are used as models for image segmentation and tracking.
Belief Revision 
Software, publications, teaching material, and news on belief revision - from the Business and Technology Research Laboratory at the University of Newcastle, Australia
Cause, chance and Bayesian statistics 
Briefing document with a short survey of Bayesian statistics
Daphne's Approximate Group of Students (DAGS) 
Daphne Koller's research group on probabilistic representation, reasoning, and learning at Stanford University
Decision Systems Lab (DSL) 
Research group at the University of Pittsburgh with links to books and software on probabilistic, decision-theoretic, and econometric graphical models
An Introduction to Bayesian Networks and Their Contemporary Applications 
A survey and tutorial by Daryle Niedermayer - covers material on Bayesian inference in general and selected industrial applications of graphical models
LAPLACE Group - Bayesian Models for Perception, Inference and Action 
Probabilistic reasoning and genetic algorithms for perception, inference and action: Bayesian cognitive and brain models, software for robotics, probabilistic inference engine
Learning Bayesian Networks from Data 
Slides and additional notes from a tutorial by Nir Friedman and Daphne Koller on automated learning of belief networks, given at the Neural Information Processing Systems (NIPS-2001) conference
Qualitative Verbal Explanations in Bayesian Belief Networks 
Paper about combining probabilistic models and human-intuitive approaches to modeling uncertainty by generating qualitative verbal explanations of reasoning.
Query DAGs: A Practical Paradigm for Implementing Belief-Network Inference 
Article published in JAIR (Journal of AI Research) about a way to implement belief networks by compiling networks into arithmetic expressions and then answering queries using an evaluation algorithm.
UConn list of Bayesian Network Resources 
Eugene Santos' lists of belief network research, papers, and systems.
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