Is there a KDE3-style System Monitor widget anywhere? That is, one with 3 columns: CPU activity, memory used and swap space used?

I've found the ones that draw wiggly lines on a graph in a little box, but none seem as intuitive to me as the KDE3 approach...

I haven't managed to find one.
The nearest I've found is KCPULoad, which at least shows information about the CPU. Can't find anything to replicate memory and swap though...

I believe I saw something about this on Planet... I think it might be in Plasma-Addons for KDE 4.2 / 4.3.

I have it on my desktop right now. It is called "System Status" or "Plasma System Status". There are a lot of others with similar names but that are not at all similar to what you are looking for (for instance I also have "System Monitor", which is completely different than System Status).