I recently checked walframalfa search engine. It is said to be a 2.0 search engine. Well it's a bit different from google, yahoo etc. We can search in different ways. walframalfa it self is like a calculator which can do very complex calculations even. Further it can compare things, suppose if your key word were "GDP france, germany", it will compare the GDP of these two countries and generate the out put. This output includes graphs of the past even. There are many other ways to search, you can find them in the examples section. Yet this has to improve a lot.
It is actually Wolfram Alpha and it is not really a search engine as most people think of it because it only searches its own limited database and does not scour the web for anything - just an FYI.