several features that Lifehacker posted several years ago: http://lifehacker.com/339474/top-10-obscure-google-search-tricks - #3 was my favorite for a while, and because the browser Opera lets you create your own search engines inside of it, you can program these in very easily.

Several features that Lifehacker posted several years ago: http://lifehacker.com/339474/top-10-obscure-google-search-tricks:

1. Make Google recognize faces
2. ID people, objects, and foreign language words and phrases with Google Image Search
3. Find music and comic books
4. Find related terms and documents
5. Remove affiliate links from product searches
6. Use Google as a free proxy
7. Compare items with "better than" and find similar items with "reminds me of"
8. Convert currency, metrics, bytes, and more
9. Track flight status
10. Get the local time anywhere

Number three was my favorite for a while, and because the browser Opera lets you create your own search engines inside of it, you can program these in very easily.