Starting today, you can download early builds of the new YouTrack version code-named "Daring" via Early Access Program.
Scheduled for public release in Q1 2010, YouTrack Daring is highlighted by custom attributes, issue-level security, extended search capabilities, improvied JIRA and TeamCity integration, and other great features. For the complete list of issues resolved for the initial YouTrack build, see release notes.
Download and enjoy the upgraded YouTrack!
Develop with pleasure!
The JetBrains Team
Read: Early Access Program for Upgraded YouTrack