For some medium-sized, low-tech site:
IE6 49.8%, IE7 34%, other IE: 0.7%, total IE 84.5%
FF 2.0.x.x 7.5%[1], other FF 1.9%, total FF 9.4%
Others 6.1%[2]
1. FF 2.0.x.x number has been arrived by adding the percentages of the seperate versions, so there's some rounding error there. Other FF has been arrived at by subtracting FF 2.0.x.x from total FF (which is accurate).
2. Similarly others has been derived by subtracting the totals for IE and FF from 100.
FF 2.0.x.x 7.5%[1], other FF 1.9%, total FF 9.4%
Others 6.1%[2]
1. FF 2.0.x.x number has been arrived by adding the percentages of the seperate versions, so there's some rounding error there. Other FF has been arrived at by subtracting FF 2.0.x.x from total FF (which is accurate).
2. Similarly others has been derived by subtracting the totals for IE and FF from 100.
You might also find this page useful:
http://www.w3schools.com/browsers/browsers_stats.asp
It contains historical and current statistics on W3Schools visitors.