XULRunner 1.9.0.5
The newest official XULRunner has been released. XULRunner 1.9.0.5 matches the Firefox 3.0.5 release. For XULRunner developers, most of the changes in 1.9.0.5 are related to security fixes. You can also look at the full list of fixed bugs.
Want to get started building XULRunner applications? We have an article for that.