No Market Share movement for WordPress 2.6 yet sorry.
Get a list of 15,285 websites using WordPress 2.6 which includes location information, hosting data, contact details, 4,264 currently live websites
which includes 569 domains that redirect to sites in the list. 11,590 sites that used this technology previously and 1,613 websites in the United States currently using WordPress 2.6.
Distribution of locations of all WordPress 2.6 customers we've ever tracked.