Life Hacker has an interesting post on Top 10 obscure google search tips . The tips are:
10. Get the local time anywhere
9. Track flight status
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
4. Find related terms and documents
3. Find music and comic books
2. ID people, objects, and foreign language words and phrases
1. Make Google recognize faces
Some of those are really useful (checking the time, or currency) and some are less useful, but do check them out.
