Get a view of your site on different combinations of Browsers and Operating Systems

Do you need to check how your website look on combination of browsers under different operating systems? Try entering the URL on the first page of the browsershots website.
Just choose the browsers you want to test under each operating system (no MAC OS available) the browsershots service will produce a series of images which area available online for 30 minutes, but that you can download and save for a more careful analysis.

It is also possible to customize the resolution of the screen on which it will run the tests, and also color depth, javascript and flash version and if Java is enabled.

Found it useful. Does anyone know a similar service online and free? Comment, please!