One of the dimensions we watch at O’Reilly is the “platform” category. At a high-level in our taxonomy, the Platform category can be split into two groups — Open Source and Proprietary. The following charts represent the “platform” world for the first five months of each year [January thru May of 2003 - 2007].
This first Chart shows Dollars for the first 5 months of each year.
The next Chart shows Units for the first 5 months of each year.
Here is a little context for these charts. The data here is for the whole computer/technology publishing market, and not just O’Reilly. The data is actual cash-register sales in bookstores, as measured by Neilsen Bookscan, throughout the United States. Typically about 85% of this market is Amazon, Borders and Barnes and Noble.
The market as a whole is down about 10% compared to 2006. The open source and proprietary trends on the unit chart have closely mirrored each other except for this year. On the revenue chart, open source has produced more dollars for the past 4 years and looks like it will again this year. I thought you would find this data interesting.