Here is the browser market share for May 2007, based on traffic to my top site:
The biggest difference from previous months was that IE showed an increase (albeit a very small one). All other browsers pretty much held steady, with the exception of Safari, which went from 0.74% in April to 0.63% in May. This drop was not significant in absolute terms, but did represent a 15% decline from April. Opera’s share held steady after a huge jump in April, which meant that the April increase was most likely real, but the momentum had slowed in May.