Pleating 101 breaks down pleating to the basics. This is a must read if you're just getting started with using pleats.
Pleated Bias Skirts: Cutting & Calculating assists in predicting fabric consumption for bias circle skirts based on the fabric width and length of the skirt. Can be used for non-pleated garments as well.
How to Use Machine Pleating shows some examples of various styles of machine pleating and gives some examples of different types of garments that can be created.
Sunburst Pleated Skirt Pattern – PDF pattern for a short sunburst pleated skirt.
Sewing Instructions for Sunburst Skirt Pattern - Full sewing instructions for the above sunburst pleated skirt.