As web interfaces become ubiquitous, more and more complex back-end processing is necessary. Of course, stateless HTTP leaves few ways to tell users what's going on. Andrei Cioroianu presents a JSP technique to display application "progress bars." [ONJava.com]
It's too bad there's so much scriplet action in this example, but the lesson is good. It'd be even nicer to see a JSTL port of this howto, or an alternate view approach (i.e. using Velocity or XML/XSL).