Seems like only yesterday that Linux was vastly outpacing iOS in terms of how many were using it as a browsing platform. Actually, make that last November; at that time, Linux's presence more than doubled the total iOS stake. Now, iOS-based browsers claim 1.13 percent of all browsing platforms, compared to a declining 0.85 percent for Linux.
To the right is a screengrab from Google Analytics, as I see traffic coming to one of my own websites. However, I'm sure the list looks very different depending on the content. For example, I'm pretty sure TUAW's #1 OS isn't any flavor of Windows