Periodic Table of Typography

Well this is just classical and great. I would follow the link to read more about the table and how it is organized. Characteristics that are noted for categorization are Serif, Sans Serif, Script, Blackletter, Humanist, Realist. They organized and ranked the type faces as well by how much they were used by doing research, however this is of course up to your own perception to a certain extent. Helvetica is ranked number 1, and I would believe that is the most popular in many facets.

Here is the link, to read it more and check out where they got their sources from.

http://www.behance.net/Gallery/Periodic-Table-of-Typefaces/193759