Both the summary and the original article fail to explain that the "Other OS" with 0.8% actually means Other *Windows* OSes. They fail completely in providing useful context about how the percentages of Windows flavours compare to those of iOS, Android, and Mac. Here are the missing stats that come from the analytics.usa.gov site: iOS 25.2%, Android 18.2%, Macintosh 9%. This also explains how Safari is the 2nd most popular browser with 26%.

Another Opera fanboy alert: AdBlock equivalent? Opera v.9+ has a sophisticated, built-in per-site ad-blocking feature. Right-click/Context menu on any site and select "Block content" to select what to block. Selections can be further edited during creation or later via Preferences.