Not quite there yet but i am almost back to Kubuntu, just loading down the desktop to install as we speak and I am looking forward very much to experiencing KDE4. So I am writing this in Gnome on my laptop which is now entirely GNU/Linux based.
Funnily enough rather than installing a GNU/Linux OS on my oldest computer, I have installed Windows XP Professional on my old PC as I still need to go back to Windows for the odd task or two (webcam and composition) and it is chuffing along nicely.