It's been almost two years since I've done a roundup of periodic tables (and six years since I posted the first one). Oh, you know the periodic table of elements; you may have even studied it. But these are different. Creative minds use the basic template to classify all sorts of things that aren't elements, and the ones that do contain real elements have a twist. See nine (actually eleven) of them in a list I posted at mental_floss.
I see that according to my account page, I have been a member of the mental_floss staff for six years as of today.