It still amazes me that users are on older versions of their browsers when upgrades are not only free but they also say "Hey l am old there is a new model out there go and get it".
The problem with web development is support for browser versions. It takes time which costs money. Now you can normally cover most of your bases by developing for FireFox. If you do there is a good chance it will work in safari and chrome as well, IE on the other hand is another issue.
Ill emit that IE8 is a huge step up but its still not perfect. Web apps should only support the latest version of browsers. I say we stop supporting old versions and make those users get with the times!!! Come on who is with me
For info on browser usage check this out