“While Windows still accounts for almost 88 percent of web use as measured by Net Applications, it is still on a steady downward trend. In April 2008, Windows' share was 91.58 percent. By April 2009, that had fallen to 87.80 percent. Most of that loss has been Mac OS X's gain - its share has risen from 7.38 to 9.73 percent over the same period [...]
“Internet Explorer's progressive slide continues: Microsoft's browser is down to 66.10 percent from 73.01 percent a year ago. Half of that loss has been taken up by Firefox (up from 19.03 to 22.48 percent), with Safari also benefiting (up from 6.31 to 8.21 percent).”