The Wayback Machine - https://web.archive.org/web/20120904160345/http://www.wolfram.com:80/cdf-player/
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Once you install CDF Player, you'll be able to...

Interact with applications from the Wolfram Demonstrations Project
Explore interactive documents in your web browser
Online interactivity is made possible by the Mathematica and CDF Player browser plugins, which are currently available for the following platforms:
Windows: Internet Explorer, Firefox, Chrome, Opera, & Safari
Mac: Safari, Firefox, Chrome (4.0+), & Opera (10.5+)
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View Mathematica examples, reports, and files

Computable Document Format (CDF)

Documents come alive with the power of computation
Powering the next generation of interactive documents, blogs, reports, presentations, articles, books, courseware, information and knowledge applications, and more. Learn more about CDF; explore uses and examples »

See CDF technology in action at the Wolfram Demonstrations Project »

Looking for Mathematica Player?

CDF Player includes all the great functionality you've come to expect from Mathematica Player—including full support for .nb and legacy .nbp files—plus new interactivity and deployment options.

Need to publish notebooks for Mathematica Player 7 users?»
Need more deployment options? See Wolfram Player Pro »