Wolfram Alpha is arguably the best computation engine available on the web right now. It is an ambitious, long-term project to make all systematic knowledge immediately computable by anyone. Here is a simple tip to use Wolfram Alpha compute whatever you want right from the address bar.
Just add a bookmark keyword in your Mozilla Firefox to open up Wolfram Alpha and give typed string as input automatically and compute it. Check the screenshot below of the bookmark from the bookmark library of Mozilla Firefox.
Have http://www.wolframalpha.com/input/?i=%s as the input URL.
Now, after saving the bookmark, whenever you type “w space
Alternatively, you can use the official downloads which include Windows desktop gadget, chrome extension, IE & Firefox toolbars amongst others. Of-course you can use Google to compute simple mathematical data, but Wolfram Alpha is a master when it comes to complex computations!
This bookmark tip can be used to access any of your favorite websites easily by associating it with a keyword of your choice. Thanks for the tip Neil Ghosh!