Wolfram CDF Player

The Wolfram CDF Player includes all the functionality from the Wolfram Mathematica Player plus a lot of new features. It's available for Windows, Mac & Linux. It also includes plugins for popular browsers such as IE, Firefox, Chrome, Opera & Safari. Download here.

More information about the Computable Document Format can be found here.

Solving Equations

I came across this post on the Science Forums, where someone was having a problem solving an equation. I thought I'd try entering it in Wolfram Alpha & was surprised when it solved it & even showed all the steps.

Wolfram Alpha

Nice video which can be watched here; will show you everything you need to know about Wolfram Alpha.