The spnego project has released version 1. The Spnego project is a Kerberos over SPNEGO plugin for JSR196 compliant application servers. Right now the Glassfish betas are compliant, with other appservers like JBoss expected to be compliant soon.
The plugin lets your Java web applications participate in a Kerberise Single Sign On environment. Log in to Kerberos in an enterprise, and you will not even need a login page in your web apps. IE, Firefox and Safari all work. And Windows, Mac OS X and Linux all work.
This project is something of a missing link for Java application servers. Apache has had mod_auth_kerb which does the same thing for Apache apps for some time. And Websphere and Weblogic have had proprietary implementations. But this release lets you use any application server.
See http://spnego.dev.java.net for full documentation and downloads.