The background for wanting to acquire this information was to discover what influence mobile browsers are having to the overall mix. As I uncover this more precise information (which I am keeping internal for the time being), I thought it would be good to share with you the more general trends.
As you can see in the graph below (click graph to see larger version), Microsoft's Internet Explorer still dominates but its overall influence (across all IE versions) has declined from 72.7% to 65.6% between January and September 2010.
This reduction is taken up by the small but increasing influence of Safari from 4.8% in Jan 2010 to 8.1% in Sept 2010, and Google Chrome doubling from 3.7% to 7.4% in the same time period. Firefox has hardly moved - from 16.1% to 16.6%.
"Other" browsers have declined from 2.7% down to 1.9% although I am uncovering some evidence that a few such browsers masquerade as leading brands (indeed you can change a setting to select a suitable masquerade from IE to Firefox!). I guess this is happening to 'fool' web sites that check if a browser is valid for the functionality on their site.
Thanks to Dave Merrilees from Tesco.com's IT user-interface team for sourcing this information for me.