Screenshots (http://cross-browser.appspot.com) is a free service that helps web developers and designers test their site for cross browser compatibility.

The part hosted on Google Appengine is free, but it does take money to maintain the setup that actually takes the screenshots (not on appengine and too complex to be on it).

Help us keep this service alive and kicking.
Planned Features:
1. Add a Re-test button if screenshots do not show up for a browser correctly.
2. Add testing for personalized pages that require a password.
3. Add automated site-wide testing (you can give a sitemap and we’ll test the entire site).