When Struts was release (in 2000 I think) it was the best thing going. It took away a lot of the pain of JSP and Servlet programming. It has built up a large user base so it is the most widely used web application framework. These days there are probably better frameworks (including the new Struts 2.0), but Struts 1.x is still popular because there are a lot of application built using it, there is excellent documentation and there is a large pool of experienced Struts developers.
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Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop