openSUSE 11 beta 2
I'm posting this from my Gateway M685 running the openSUSE 11 beta 2 Live CD and Firefox 3 beta 5. It is, simply put, very good. The version I booted and tested was the KDE 4 desktop (KDE 4.0.3 release 17). I can't do much more than a cursory report as I did not install it. I'll touch on what caught my eye.
The live CD booted into the graphic desktop without any problems whatsoever, and into the notebooks full 1680 x 1050 resolution. It did not have any drivers to take advantage of 3D acceleration, but the driver that was used provided more than adequate 2D performance for the desktop.
One small but very important application I've come to appreciate is Dolphin.