First of all: No, I'm not interested in Plasma widgets.<p>In my case they are useless because I never see my desktop's background. My desktop is full with windows...
I'm looking for a nice small tool like GKrellM is, but based on KDE4's UI. GKrellM runs in it's own window, this is why i like it to much.
It is wonderful but it is a bit outdated and does not really fit into my shiny new KDE4 desktop.