Lorelle VanFossen has published a detailed article that covers a wide gamut of statistics related to WordPress. Most of the numbers are impressive. Amongst the stats, the one that surprises me the most is the fact that WordPress is being used in Indonesian at almost triple the rate of English, and nearly the sum total of English, Swedish, Dutch, and Romanian. I find that to be incredible and reminds me that the software not only has a big following here in the U.S. but has a much bigger following outside of the English language.
All The Stats You Need To Know Regarding WordPress