Ever wonder how your site looks on someone else's computer?
Can the visitors to your site see (100%) what you are trying to present on your web-page?
Well just like many other things online, google can help you answer that question too. Google just published a tool called Browser Size that lets Web-masters see how much of their pages are visible in people's browsers.
Using this visualization tool Google confirmed that on Google Earth's page about 10% of users couldn't see the download button without scrolling, and never noticed it as a result. You can read more about it at their blog here.
Browser Size is based on a sample of data from visitors to Google.com. This is Google Labs product not tailored for your website but this tool is still very relevant because most of your visitors are also Googlers. It doesn't show you the true picture if your site has fluid width. Go ahead, try it at http://browsersize.googlelabs.com/ and see if you can make any chages to make your site better for your visitors.