I found an interesting 3-part article by Chris Double on using continuations for web programming. It's an interesting read. Chris uses Scheme which has first-class support for continuations. Common Lisp doesn't support continuations, but it's still an interesting read. Some of the ideas can be simulated in Common Lisp in other ways. I'm going to be doing a bit of a project here shortly to compare the productivity of a CL-based web program with the Servlet/JSP/Struts models I'm also familar with. It will be interesting to see what comes out on top.