Qt Quick Components
Qt Quick Components are ready-to-use UI elements for QML that fit well into the native User Experience. They will be available as a plugin module to Qt 4.7(.x). The project is available on gitorious [gitorious.org] including project description [bugreports.qt.nokia.com] and requirements [bugreports.qt.nokia.com], tasks [bugreports.qt.nokia.com] and bug [bugreports.qt.nokia.com] tracking.
The project has multiple points of contact for those interested in collaborating; irc [irc.freenode.net], qt-components@trolltech.com [lists.trolltech.com] and of course the detail project in bugreports.qt.nokia.com [bugreports.qt.nokia.com] (For a full list of IRC channels of interest to Qt developers, see OnlineCommunities.)
Other component libraries
There are several existing open source component implementations out there. See QtQuickOpenComponents for a list of those.
