Shell (command prompt) offers fastest way to finish your work. However, not everyone out there is comfortable with shell. Therefore, you end up using KDE or Gnome. After some time you will fill that, you need combination of both keyboard and mouse to get best result.
Novell has published a nice list of essential keyboard short cut that will save your time under KDE or Gnome desktop.
"...Tired of using your mouse so much? Did you know that both KDE and Gnome have keyboard shortcuts for just about everything you can do with a mouse?..."
This is useful and helpful for all new and advanced users :)