Logic Problems - Very Easy
Logic Problems - grouped by difficulty. Includes answers and hints.
The Logic Lab: simulating simple circuits of logic gates...
A free browser based application for simulating simple circuits of logic gates.
BrainDen.com - Logic Puzzles
Collection of logic puzzles, riddles, optical illusions and games.
The Paradox of the Knower
An idler's miscellany of compendious amusements