Screenster provides visual UI test automation for web applications. It is the only tool that validates the screens that users actually see. Like the traditional tools it works by recording the user interactions with the page. Unlike the other tools, it automatically captures the entire rendered page as an image and stores it as a baseline. As soon as you are done recording, you are practically done automating.
We have built Screenster out of necessity of internal use. It has been used successfully by some of our clients and this led to a cloud based version currently being developed under visualtests.com brand.