Google Analytics has a nice little visualization tool. With this, you can create good looking graphs and animations for various kinds of data. I have created a small sequence to show you the change of browser types that visitors of my blog have. The data is from 2009 (January through December) and shows that my visitors love Firefox, but also that Chrome and Safari are fighting for the 3rd place. Not quiet the data big research companies have, but I am glad people use Firefox instead of Internet Explorer.
Geek. Projects. Software. 
Go for chrome, there will be a day, where Chrome is bigger than IE and Firefox together