Here is a quick snapshot of the browser version marketshare as of December 08 from MarketShare:
| IE 7.0 | 46.77% |
| IE 6.0 | 20.46% |
| Firefox 3.0 | 17.18% |
| Firefox 2.0 | 3.77% |
| Safari 3.2 | 3.39% |
| Safari 3.1 | 3.28% |
Two things of interest here....IE6 still has a 20% market share and FF3.0 has climbed to 17% share in a very short period of time.

I would also add that the little OS left for dead a few years ago is now pushing 7%.
Safari as a percentage is still seeing steady growth on all of our websites.
What was the browser market share previous to December 2008?
Previous year? Previous month? All browsers or were asking in my response to the Mac?
This page has some charts and recent historical data:
http://e-janco.com/browser.htm