It's always important to know for developers what browsers they are developing for, who dominates the market, and what the current trends are.
I have gotten my hands on the Plaxo.com visitors' browser stats for December of 2009.
This information is valuable because Plaxo has a relatively general demographics, as it's not a site only geeks or only moms visit, and the statistics tends to not be skewed. Therefore, as you can see, Firefox doesn't occupy the same share as you might see on a techy site (on this site, more than 50% of users visit in Firefox).
Also, since Plaxo has a couple million monthly visitors and therefore a couple million data points, statistically speaking these numbers are relatively …