Gregor, I have been using Fedora 10 (KDE 4 spin) for about 6 weeks now, and have been quite pleased with it. I am a "distro hopper," so for me to land in one spot and stay is not a small thing. Fedora 10 has a large community with lots of help, and is known for being pretty close to the cutting edge with its apps. 64-bit is well supported. You will find that KDE 4.2 (beta available now) is much more "finished" and complete than even 4.1.4. As for absence of bugs and annoyances, well... I had to ...