Cool Google features

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I'm a real Google addict. I use their Mail, Calendar, Talk, Maps, Earth, Reader ... and of course Search Service. But Google has some really cool features in the Search if you know how to use them accurately. Some examples:
- The weather in London or Brussels
- Flights from Brussels to London
- films with blood in the title
- 100 Euros in Pounds
- Current time in Tahiti
- 160 pounds times 4000 feet in Kilocalories
- Finance information on Cisco
- 100 Hectares in Square meters
- Phi times 2767 or Pi times 100
- books about blogging
- Who links to my site?

You can find all of them here.
(via Minus3)