Atlassian has released version 3.4 of JIRA, a $1200-$4800 payware J2EE-based bug tracking and project management server application. Version 3.4 adds per-project issue types, wiki notation support, 'cloneable' portlets, new plugin types, and improved RSS support. I've been using Jira lately with Jaxen and Apache (though Apache's Jira is flaking out as I type this). It's a definite improvement over Bugzilla. I'm not sure it really does anything that Bugzilla doesn't do (at least not anything I use) but the user interface is about a hundred times cleaner.