On speed of releases by edition
Some were asking about how fast the various editions have been releasing, and I decided to check that out.
Methodology: I went to
Dungeons & Dragons and looked for "adventure" and "accessory" products, ignored "core game" products, and removed any "accessory" that isn't either a softcover or hardcover book. Adventures could be either.
I looked at each edition from its starting point, either the release of the core books, or if there was a preceding adventure, that month, and looked at the next 12 months. If first book wasn't a core game book it counted to total. (I'm not 100% certain the sunless citadel came out first, as the core 3.0 books are no longer listed in the porduct guide and I couldn't find the date elsewhere on the internet, so I decided the adventure came first)
I also looked at intervening periods, one the editions got 'into the swing of things' to see if there was an increase in production levels.
3.0 - 08/2000 to 08/2001
Starting with the sunless citadel
Adventures - 6
Hardcovers/Softcovers - 9
Total non-core books in first year: 15
(3.0 in mid lifecycle) 05/2002 to 05/2003
Stronghold Builder's Guidebook
Adventures - 1
Hardcovers/Softcovers - 12
Total non-core books in year: 13
3.5 - 07/2003 to 07/2004
Starting with PHB/DMG/MM
Adventures - 1
Hardcovers - 13
Total non-core books in first year: 14
(3.5 in the swing of things - mid edition) 08/2006 to 08/2007
Starting with Tome of Battle & Dragons of Faerun
Adventures - 9
Hardcovers - 18
Total non-core books in year: 27
4.0 05/2008 to 05/2009
Starting with H1 Keep on the Shadowfell
Adventures - 8
Hardcovers - 12
Total non-core books in first year: 20
Analysis: 4th edition has indeed bumped up production of books from the begining of 3.0 through the first year of 3.5, where WotC was putting out approximately 14 books a year. Of note, the 3.0 books tended to be short (the original splat books) and less expensive. 4th edition has actually dropped the number of books in comparison to the 06/07 period (at least) of 3.5, and that period saw an increase in both short and long adventures, and a increased number of hardcovers too.
So people who feel books are coming out too fast are right in comparion the launches of 3.0 and 3.5, with the caveat that the people who feel they are coming about right, likely are comparing it to the general lifecycle releases of 3.5, not the launch.