The numbers, reported from Market Share, show a slight increase for Safari from 6.37% of the browser world in August to 6.65% in September. On the other hand, Internet Explorer started with 72.15% of the market, and ended September at 71.52%. While that change seems infinitesimal, readers should note that IE's share has been steadily dropping over time.
Firefox actually dropped in market share during September, down from 19.75% to 19.46%. Google's Chrome browser, which first appeared in September, has only grabbed 0.78% of the market so far.
What does this all mean? Not much, when looking at just one month of data. However, the long-term trend is indicating that Safari and Firefox continue to gain market share steadily at Internet Explorer's expense.