I took these screenshots using a Kubuntu Intrepid Beta installation after performing a full dist-upgrade, at 1280x1024, with the nVIDIA 173 driver installed. I left all the settings in applications default, but I had to make fonts smaller and resize windows (in Konqueror for example), because they didn't look very well as default. The default theme used is Oxygen.
Moving a window around
K3b - KDE4 port not available yet
Good ol' Amarok
I think KDE 4.1.2 looks just awesome, and so does Kubuntu. The only problem is that it's not very stable, and there is less than a week until it should be released as a new stable, 18-month supported distribution. Konqueror crashes very often with segmentation fault errors, and gives no feedback in return. It just disappears, so I had to run it from Konsole in order to see the output.
The main problem I encountered was that most of the windows and widgets must be resized, and the resolution Kubuntu uses by default is the maximum supported by my Philips 107P5 CRT monitor, and that's 1920x1440. For this resolution, default fonts are very big.
Here's how the Display tab in System Settings looks like:
You'll have to actually scroll in order to see the drop-down list to select the frequency. I think this is the kind of work which a distribution must fix and polish, not necessarily the KDE team. Of course, Kubuntu never does these things anymore, so I don't even expect it to.
This screenshot also shows the available resolutions, so pick any colour you like:
As you can see, the font size is too big. It's true, after changing the font sizes it looks well, but this should have been done by default.
I encountered artifacts everywhere, but I'm not sure if it's because of the nVIDIA driver or KDE, and I never had the occasion to test KDE 4 with another graphics card. Scrolling and window resizing is also extremely slow.
Here's another addition from the Kubuntu developers, but I guess it never matters that you can see only the upper half of the text 'your password' (and that is after I switched text size from 9 to 7):
I recommend Kubuntu Intrepid if you want eye-candy and bleeding edge software, but I strongly advise against using it for a stable, productive system. I think you'd be better off with Ubuntu or Debian + KDE 3.5.9 for that.
Overall, I found this beta looking very good with a little tweaking, and since I'm a KDE fan, I'm happy to see how good KDE 4.1 can look. I think all the new development which has been put into KDE 4.x, all the eye-candy, beauty, transparency effects, artwork, and a completely new approach really makes up a powerful, innovative desktop environment, and I hope for improvements over time and even more usability where possible.