10. Get the local time anywhere
What time is it in Bangkok right now? Ask Google. Enter simply what time is it to get the local time in big cities around the world, or add the locale at the end of your query, like what time is it hong kong to get the local time there.
9. Track flight status
Enter the airline and flight number into the Google search box and get back the arrival and departure times right inside Google’s search results.
8. Convert currency, metrics, bytes, and more
7. Compare items with “better than” and find similar items with “reminds me of”
6. Use Google as a free proxy
5. Remove affiliate links from product searches
4. Find related terms and documents
3. Find music and comic books
2. ID people, objects, and foreign language words and phrases with Google Image Search
1. Make Google recognize faces

This list has been severely abridged. To read the full list, view the original post at it’s source:
Top 10 Obscure Google Search Tricks (Lifehacker)