StatCounter, which tracks Internet data, said that IE's share of the browser market fell to 49.9% in September. More people still use IE than any other single browser, but the combined market share of non-Microsoft browsers now outpaces IE. (source CNN [money.cnn.com])
If your target audience is US, it is no surprise you are not seeing this, since this is a global average. Here in Germany I have close to 55% Firefox and IE combined below 30%. The market share of non IE browsers in Europe is much higher than in the US. And since there are more internet users in Europe than in North America the global average of IE is much lower than a look at a US websites stats might indicate.