4. Attack of the Clones. Since 2008 there has been an OSR revival. There is no OSR Pathfinder as people are playing around 20+ clones and retro games but the major ones seem to be Dungeon Crawl Classics and Castles and Crusades. Gygax magazine under a new TSR has been launched as well and it out sold Ghosts of Dragonspear Castle on rpgnow.com. The big selling PDFs on D&Dclassics.com are all TSR era adventures. It is hard to say how big the OSR community is but they are producing more content than Paizo and someone is buying the adventures.
Most of the "OSR Revival" stuff seems to be generated by the RPGNow.com rankings. As RPGNow is the "The Leading Source for Indie RPGs" it is not surprising that Indie companies dominate the charts there.
Their rating system is Popular Pick and a Metal/Medal Rating (Plat, Gold, Electrum, Silver, Copper).
When you go to DrivethruRPG.com the top games look substantially different as that's the site for "The Largest RPG Download Store!". People go here to buy the mainline RPG products (in 2008-April 2009 Wizards sold their PDFs here).
Their rating system is Best Sellers and a Metal rating.
And then DnDClassics.com is only WotC/TSR. Their rating system is also Best Sellers and a Metal rating.
The rankings of products differ significantly depending on which site you are on.
The two available Next products are doing pretty well for being Adventures and not Core Rulebooks or Magazines. (Yes GoDSC contains the rules that almost 200,000 players downloaded for free but the rules are hardly the draw).
Ghosts of Dragonspear Castle: Copper Popular Pick on RPGNow, Electrum Best Seller on DriveThruRPG, and Electrum Best Seller on DnDClassics.
Vault of the Dracolich: Copper Popular Pick on RPGNow, Silver Best Seller on DriveThruRPG, and Electrum Best Seller on DnDClassics.
The best selling DnD product per DnDClassics is the Moldvay Basic Book.
D&D Basic Set Rulebook (B/X) Moldvay: Electrum Popular Pick on RPGNow, Gold Best Seller on DriveThruRPG, and Platinum Best Seller on DnDClassics.
Rules Cyclopedia: Popular Silver Pick on RPGNow, Gold Best Seller on DriveThruRPG, Electrum Best Seller on DnDClassics.
The only products on DnDClassics ahead of the 2 modules are 4 products up for nearly a year and that were offered free for a period in the last year (B/X Basic book. B/X Expert book, B2 KotB, and T1-4 ToEE).
What analysis of the 3 PDF portals tells us is that: 1) the rating systems are not equivalent across the 3 sites, and/or 2) Each product is only rated relative to sales on that site.
I assume that the rating system of Popular Picks and Best Sellers are not equivalent (Best Sellers represent much higher sales) and that each product is only rated relative to sales on that site which is obvious to me when I compare B/X Basic and Rules Compendium.
Which only says that people looking for indie games are buying less WotC product and people looking to buy DnD use the storefront dedicated to DnD.
And nothing against Gygax magazine as the main quarterly general 'D&D' magazine available.