No Market Share movement for WordPress 2.1 yet sorry.
Get a list of 2,110 websites using WordPress 2.1 which includes location information, hosting data, contact details, 902 currently live websites
which includes 139 domains that redirect to sites in the list. 1,347 sites that used this technology previously and 411 websites in the United States currently using WordPress 2.1.
Distribution of locations of all WordPress 2.1 customers we've ever tracked.