Run Browsers From Web: Browser Sandbox
Browser Sandbox is an online platform which makes launching various browser versions possible.
It requires an installation of a plugin & can run:
- Firefox 2-3-3.5
- Apple Safari 3-4
- Opera 9-10
- Google Chrome
The platform is definitely a gold mine for making cross-browser tests quickly & easily.
P.S. Spoon allows you to convert your own apps to Spoon apps & post them on the web. You can check the platform's homepage for that.