from the Gutenbook site: Gutenbook is an app for downloading, and reading of etext books published electronically from the Gutenburg Project. it's fairly basic but it works, and has ports for linux (tk or qt) and windows. not only is this a needed app, it looks like a great starting point if you are interesting in learning to hack one of these environments (gtk-perl or kde/qt).
as seen at freshmeat: "An installation script, bugfixes, urls for each reference for the text-formatted e-mails, and an option to stop getting empty e-mails." See biomail.sourceforge.net for more.
according to Peter: "Version 0.3 is a complete rewrite of the Avanti code base after a rethinking of the basic architecture and design. The result is the beginnings of a simple, highly modular and scalable client/server architecture using its own native messaging protocol for client/server communication." For more, see the Avanti site or you can telnet to the live demo to try it out.