The 4.2 version of KDE has been released! This polishes up the existing KDE 4. With new planted features aiming at ease of use, improvements of softwares and lots of bugs fixed.
KDE now has a polished looking desktop environment with its updated Vista-style taskbar. It also included Google Gadgets on one of the Plasma applets. It had also improved the desktop effects and other minor navigation improvements.
See KDE 4.2 here.