I started Jambi package to Mandriva at Akademy this year, but process was complex since we're dealing with buildsystem changes, Java new packages, Qt4 layout changing, so lots of barriers to get the task done.
My personal effort on this is have next Mandriva releases be ready for developers in all cases, to use best available Qt and KDE technologies as possible, improving our situation from the past.
Then, yesterday i had all things in really good shape, and finally a good initial package could be produced.

One should think that reading and writing XML are solved problems. But interestingly there still is heavy development going on in this area. So Trolltech includes their new QXmlStreamReader and QXmlStreamWriter classes since Qt 4.3, which was released less than two months ago. Today I used these classes for the first time and was delighted. This is the first XML API which lives up to the high standard of Qt.

Today I discovered an application that is using Qt4. It was a complete surprize, as this is a software that you can download from a photo-shop's web page to create so called "photo-books". Unfortunately it is a Windows only application, but I was happy when I saw that QtCore4.dll & others were installed (inside wine). :)
The application is in Romanian, but as I saw it was developed in Germany. It is called CEWE Fotocartea Mea (CEWE My photobook) and can be downloaded from here.

QT/Jambi, recently released, works on Solaris 10 with Sun Studio 11 and QT 4.3.0.

Mandatory pretty screenshot:

http://www.stefanteleman.org/qtjambi/jambisolaris.jpg.

(warning, lame marketing attempt following)

I am happy to report that Wengo (the company I work for) has finally released version 2.1.0 of the WengoPhone, a GPL licensed, Qt4 based, cross-platform softphone featuring SIP based VoIP, multi protocol IM support (thanks to libgaim libpurple), SMS sending, PSTN calls and much more.

BTW, new Qt4.3's QWizards's field system (see QWizard::field()) looks really useful. It is a clean version of approach to the one we discussed last year -- where we refer to pages/data widgets by name (or ID) and not by pointer.

After almost a year of I am working on the Qt3 D-Bus bindings again.

The past week I have been fiercely working on getting them in shape for the requirement of the D-Bus based DAPI implementation on KDE3.

Since working with bindings is quite boring I decided to write a code generator that creates nice wrapper code for D-Bus interfaces (service and client side).

This really got me into hacker mood, so aside from the benefit of easier debugging later on I had the necessary commitment for free :)