I am very annoyed with Firefox at the moment, I installed all the updates for Fedora 15 with the yum update command and I was updated to Firefox 8.0 and my Greasemonkey addon stopped working as it was incompatible with version 8.0. That is the annoying thing with Firefox, the newer versions break some addons. But I am sure that the plugins will be updated to work with the newest browser releases. I have uploaded a nice video of my KDE 4.6 desktop, I have made this video to show how nice this desktop is and how well it works on a modern computer. And I have installed Ubuntu 10.10 as I wrote in my last post, the Ubuntu 10.10 Gnome 2.32.0 desktop is extremely sleek and fast indeed, Xfce is a nice and fast alternative, just type sudo apt-get install xubuntu-desktop to install this as a replacement for the Unity desktop if you are using that and are annoyed with it as I was when I tried out the Ubuntu 11.04 and 11.10 desktops and experienced the Unity interface for myself. The Lxde desktop is also a very light and fast alternative, type sudo apt-get install lubuntu-desktop and choose the lxdm login manager and then re-boot your computer to enable a very light and sleek Ubuntu desktop experience.
That is the best thing about Ubuntu, you are free to install a different desktop if you are not happy with the one you are currently running.