According to the WordPress download counter close to 400,000 downloads have been recorded of the 1.5* release.
So how many installs are there?
If you take into consideration the number of blogging platforms based on WP or MU the number grows exponentially and this is without even considering the number of hosting providers offering it preinstalled.
How many installs of WordPress?
Google finds 5.8million sites containing the string”powered by WordPress”; however, many sites will appear more than once, while many others either won’t be Google-indexed or will have removed the acknolegement.
Or changed the text of the acknowledgement 🙂