What made me realize this was a tweet on the periodic table of HTML 5 elements.
|Periodic table of HTML elements|
Then I woke up today and realized: I ran across several of them in the last years. Here are some of them
|Periodic table of irrational Nonsense|
|Periodic table of typefaces|
|Periodic table of visualization methods (cool mouse overs)|
|Periodic table of controllers|
|Periodic table of condiments ;-)|
And this last one is a real periodic table. It uses pictures. @IPhoneOwners: I envy you, there is an app. But not for long - Android is in development. For me it is the book on my amazon wishlist.
|Photographic periodic table|
BTW: I also came across periodic tables for sweets, cursing, beer and similar. If you really want to see them you will have to use google...