jQuery version 1.4.2
http://blog.jquery.com/2010/02/19/jquery-142-released/
JavaScript Libraries and Functions
Get access to data on 5,355,830 websites that are jQuery 1.4.2 Customers. We know of 1,176,862 live websites using jQuery 1.4.2 and an additional 4,178,968 sites that used jQuery 1.4.2 historically and 689,715 websites in the United States.
Get a list of 5,355,830 websites using jQuery 1.4.2 which includes location information, hosting data, contact details, 1,176,862 currently live websites and an additional 604,063 domains that redirect to sites in this list. 4,178,968 sites that used this technology previously and 689,715 websites in the United States currently using jQuery 1.4.2.