Qt Software (formerly Trolltech) released a new version of Qt SDK. Qt 4.5.1 includes bugfixes and optimizations made since the release of Qt 4.5.0. The list of changes can be found here. Qt Creator has been updated to reflect the feedback gathered since the initial release. A full list of changes is here. Finally, after two betas and an RC, Qt Software released the final version of the Visual Studio add-in. It is now available for download.