This handy Google Labs tool will allow you to see your website as seen by users with different screen resolutions. One of the major challenges while designing a website template is to design the template so that user can read the relevant information at the very first glance itself. Sadly this depends on the visitors screen resolution. This tool from Google Labs will overlay a transparent ruler like layout to the web address you give it, thus enabling you to see how your web site looks at screen resolutions other than yours.
The tool allows basic settings such as transparency adjustment of the ruler. You can use Google Analytics to know what resolution is used by most number of your visitors. Then you can head over to Browser size and see what all portions of your website is viewable at that resolution. This will allow you to make your web site more accessible and improve the “page views/visit” as well as “bounce rate”.
The following is a screen shot of my Google Analytics page showing the details of this blogs visitors and their screen resolution.