Hi, since desktop applet are libraries (.so files) then it's not so simple making Qt desktop applet.

At moment I didn't investigate for a solution.. but it's possible (I tried it) to put Qt Widgets into the desktop just changing the Window Type of the widget (eg a QDialog) with the right Window Type.

Then a Qt application can put widgets in the hildon-desktop but the "applet manager" that loads the desktop widgets doesn't recognize them as applet, then it doesn't manage Qt home applets.