Browser shots is a fine website which gives you a bunch of screenshots of your site in different operating system, different browsers. You can select sizes, colour, and javascripts from the option to view in your convenient.
Browsershots makes screenshots of your web design in different operating systems and browsers. It is afree open-source online web application providing developers a convenient way to test their website's browser compatibility in one place.

(old look of this site)

(current look of this site)
This tool will help to those who designs his own mobile site for both mobile and web browsers. Creating for both medium will help to catch both website users and wapsite users. So, consider and use.
http://Browsershots.org