Nokia today released version 4.6.1 of Qt on 19 January 2010: the cross-platform application and UI framework, and version 1.3.1 of Qt Creator: the cross-platform IDE for Qt development . Qt 4.6.1 brings improvements to developers targeting Symbian, most notably introducing a binary compatibility guarantee as announced with the Qt 4.6.0 release in December 2009. Both releases introduce bug fixes and optimizations made since the Qt 4.6.0 and Qt Creator 1.3.0 releases.Source>>>