Stephen Downes' guide to fallacious reasoning. This isn't just a list; Downes provides definitions and examples of each fallacy and fallcy-group
From the Fallacy Files blog; a tree diagram taxonomy of formal and informal fallacies and in-depth treatment of each
List of all 256 categorical syllogisms noting the validity, mood and figure of each
Interactive exercises on validity, fallacies, truth tables and more. companion to the Power of Logic textbook but is applicable to students studying any introductory logic textbook.
Oxford University Philosophy's collection of tutorials and exercises on basic logical concepts