Slightly related is Opera transitioning from version 9.x to 10.x: http://www.sitepoint.com/opera-10-user-agent/ http://www.sitepoint.com/opera-10-user-agent/ (c

Slightly related is Opera transitioning from version 9.x to 10.x: http://www.sitepoint.com/opera-10-user-agent/ http://www.sitepoint.com/opera-10-user-agent/ (couldn't find the original dev blog)