Website Sizing for Optimum Viewing

Google has just released a tool that tells you how many people can see
how much of your website page without scrolling: http://browsersize.googlelabs.com/
Enter your website URL and sit back.

The percentages are not based on screen resolution statistics, but on the actual browser sizes of visitors to google.com. In other words the figures take into account the fact that some
people don't maximize their browsers.