Originally Posted by windstory
snowpine/ If possible, please let me have a link for tutorial or guide documents.
Like Knightron said, Fedora is just a different distro. It has the latest KDE desktop and kernel and applications and everything, and will give you a modern desktop/laptop experience, as as opposed to Scientific Linux, which is more intended for servers and laboratory workstations, as I understand it.
Anyway, you can see screenshots and downloads and stuff here: http://fedoraproject.org/
I just kind of threw Fedora out there as a suggestion because, to be honest, I'm not exactly sure how to upgrade KDE in Scientific Linux (which I do actually use, but with Gnome desktop) without risking some instability/breakage. But did you know that even older versions of KDE are very flexible? Check out here for some suggestions: http://kde-look.org/