Browser Sandbox is an online platform which makes launching various browser versions possible.
It requires an installation of a plugin & can run:
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IE6-7-8
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Firefox 2-3-3.5
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Apple Safari 3-4
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Opera 9-10
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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.
Requirements: Spoon Plugin
Every web designer tries to create a draft of the design that the client can easily imagine "how it will be after it is online".
This is a set of Photoshop templates of Firefox (Mac & PC) & IE to help this process.

Every browser template has 3 resolutions ready:
- 1280*1024
- 1024*768
- 800*600
Title, address bar, scrollbar & favicon spots are also easily editable for a better presentation.
With many different operating systems, many browsers and different browser versions the design of a website can look different to every user.
Testing your website in different browsers easily is possible.

Browsershots makes screenshots of your web design in different browsers. It is a free open-source online service created by Johann C. Rocholl. When you submit your web address, it will be added to the job queue. A number of distributed computers will open your website in their browser. Then they will make screenshots and upload them to the central server.
Requirements: No Requirements