here is one of this cool stuff!
“the evaserver is a small and fast java-application-server, who offers you to create distributed web-applications with a dynamical web-interface in combination with the remote object framework (rof). the web-applications created with this suite offer you a look & feel or usability as you know it from desktop-applications on a website.”
things like auto-completion while typing (known from your desktop mail-program) or drag & drop of an email to a folder are just two simple examples, which become possible in a web-application (see gmail or google suggest for instance).
the evaserver makes it easy to develop rich internet applications and is primarily addressed to web-developers.
if you have any further questions just visit max’ website or drop him an email.
p.s.: see also the web 2.0 mashup matrix