I've had the 10.1 build for about 2 weeks now but didn't have much time to experiment with it until today. I must say that the speed improvement is quite significant but the system stalls alot(for apparently no reason). Apple really has to fix the process viewer. The user should be able to acces it under any codition, but this is not so. For example, if an application is using the fullscreen, pressing command-option-esc doesn't bring up the process viewer window...but I'm getting off track now. The reason of my post is the new volume and contrast controls in osx. They look VERY cool. When you adjust the volume or contrast a translucent window appears showing the level the you're setting.