@Carnildo said:
The majority of the change is from new traffic, which is almost invariably Firefox (the main source of new traffic for my site is a forum with a [i]very[/i] vocal Firefox advocate). The rest is from people changing browsers, split roughly evenly between IE -> Firefox, IE -> Opera, and IE -> Safari.
You know your site best. For some reason, I got the impression your site didn't handle IE users, which is what I get for reading the messages too quickly 'cause I'm at work.
I don't know what business you're in. In the airlines, numbers as small as 2% make a huge difference--even for a smaller, regional airline. Seeing 31% reflexively triggered "crud, that's huge!" neurons in my brain.