No Market Share movement for WordPress 3.1 yet sorry.
Get a list of 169,881 websites using WordPress 3.1 which includes location information, hosting data, contact details, 64,160 currently live websites
which includes 4,923 domains that redirect to sites in the list. 110,644 sites that used this technology previously and 13,879 websites in the United States currently using WordPress 3.1.
Distribution of locations of all WordPress 3.1 customers we've ever tracked.