I would highly recommend Interchange 1 (http://www.icdevgroup.org). It's an e-commerce platform and it really pushes Perl to the limits: * The best open source e-commerce app there is. * Apache-style Preforking Daemon * Has it's own language parser (ITL) * Embedded perl anywhere (using Safe) I don't think there is a feature of Perl that it *doesn't* use. -Dan 1 (As a core developer of Interchange, I'm slightly biased).