While most people use Internet Explorer, a sizable portion of your users will use other browsers such as Firefox or Safari. Therefore it’s prudent to check your web design on different browsers to ensure all users view the webpage as it’s intended.
:: Browsershots is the most comprehensive service, offering multiple versions of browsers for various operating systems.
:: BrowserCamp focuses on Mac browsers.
:: BrowserCam offers a 24 hour free trial period.
:: Litmus cover Windows browsers.