Atlassian has released version 3.10 of JIRA, a $1200-$4800 payware J2EE-based bug tracking and project management server application. 3.10 adds editable worklogs, start Dates for worklogs, new ways to browse components and versions, and an AJAX-based user picker and issue picker. I've been using Jira lately with Jaxen and Apache. 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.