For many projects I end up developing and testing my web applications on Internet Explorer, Firefox and Safari. This strategy, though sufficient for testing common scenarios, does not take into account multiple operating systems, browser versions or additional browser vendors. Any of these factors might introduce compatibility issues. It would be very costly, boring and ultimately unrealistic to manually test against all of these possible variations.
This is where Browsershots enters the picture. This open source service (created by Johann C. Rocholl) generates screen shots of your web application running under your choice of over 40 web browsers that span 4 platforms.
I'm very pleased to have such a tool available for automating the leg work that goes into browser testing, especially for the less likely scenarios.