The API documentation at http://developer.qt.nokia.com/doc/qt-4.8/qstring.html is not searchable. In previous versions, the entire page could be searched in one go, now one has to expand two hundred sub-items individually.
Similarly, cut-and-paste of function prototypes yield invalid C++
Compare that to http://doc.qt.nokia.com/4.7/qstring.html:
Both issues reduce the utility of the documentation significantly.