Towson University
Towson University: Drawing Lewis Structures
Brief rules for writing Lewis structures for simple compounds. Some examples are included.
Other
University of Wisconsin Oshkosh: Lewis Structures Tutorial
This site lists easy-to-follow steps for drawing Lewis Structures. Examples are given.
Chiral Publishing
Chiral Publishing: An Introduction to Chemistry: Resonance
This section from "An Introduction to Chemistry" describes how to draw resonance structures. A few examples are given. Also find links to 3-D molecular models of the examples.