No Market Share movement for WordPress 2.3 yet sorry.
Get a list of 6,088 websites using WordPress 2.3 which includes location information, hosting data, contact details, 1,523 currently live websites
and an additional 513 domains that redirect to sites in this list. 4,565 sites that used this technology previously and 685 websites in the United States currently using WordPress 2.3.
Distribution of locations of all WordPress 2.3 customers we've ever tracked.