Phonon, the sound server for KDE applications, can now directly use the PulseAudio sound server.
WebKit web page rendering engine, as used in other popular web browsers like Safari and Chrome, is now available in Konqueror and other KDE applications. Konqueror also features improvements that enable it to load web pages faster.
KWin window manager features many improvements:
Nepomuk Semantic Desktop.
irc: addresses to be handled in GNOME.