Most people are still using Internet Explorer, specifically version 8.
Windows is still the most prominent Operating System with almost 90% of the Market share. Windows XP accounts for half of the overall Windows market share and Windows 7 has jumped to 25%.
Google has 84% of the Search Engine Market Share with Bing gaining the most traction as it chases a 5% Market share in a race with Yahoo (Yahoo actually uses the Bing Engine, so technically you could say the Bing platform has 10% of all Search Engine Market Share).
Statistics are broken into Total Share, Version Total share & Version Trend over time.
Browser Total Market Share
Browser Version Market Share
Browser Version Trend
Operating System Total Market Share
OS Version Market Share
OS Version Trend
Search Engine Total Market Share
Search Engine Version Market Share
Market Share Statistics Via NETMARKETSHARE