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An interesting site that gives visual comparisons of "stuff". Visual comparisons of objects. Perspective of size.

"Enter your question or calculation and Wolfram|Alpha uses its built-in algorithms and a growing collection of data to compute the answer."

Wolfram/Alpha is to be the first web-based tool that can find answers to all systematic knowledge in the world. For educators, this "computational iknowledge engine" can find objective and fact-based answers for a variety of subject areas. Type in "Newton's Law," for example, and the formula for force is explained. Enter in an equation for a line, and the site plots the line on a graph. Ask "What is the GDP of the United States and Canada?" and a chart depicts a side-byside comparison of the nations' economic data.

Can't choose default search engine? Want to compare Bing & Google results? This is the right place to be. Just put your query in the search box and press Enter. You'll see results from both engines side by side. Search provider for Internet Explorer 7/8 and Firefox is also available - search both engines from your browser!

Blog, wiki or google doc? Which do you need for what you're trying to accomplish? This matrix can help you decide.

New web application that allows users to compare and merge text documents online. You can upload different versions of the same text document and see what has been changed. It automatically color codes changes it finds between the different revisions of a document and provides user with an easy way to approve, reject, or set aside a change.