Here's the list of our top ten Google tricks many people who use Google don't know about.(See more Google Services: 10 of Google's Most Useful Internet Tools)
1 - They have "Definitions"
Pull up the definition of the word by typing define followed by the word you want the definition for.
For example, typing: define bravura would display the definition of that word.
2 - You may try "Local Search"
Visit Google Local and enter the area you want to search and the keyword of the place you want to find.
For example, typing: restaurant at the link above would display local restaurants.
3 - Try "Phone number look up"
Enter a full phone number with area code may display the name and address associated with that phone number.
4 - Find "Weather and Movies"
Type "weather" or "movies" followed by a zip code or city and state to display current weather conditions or movie theaters in your area.
For example, typing weather 84101 gives you the current weather conditions for Salt Lake City, UT and the next four days.
Typing movies 84101 would give you a link for showtimes for movies in that area.
5 - You may "Track airline flight"
Enter the airline and flight number to display the status of an airline flight and it's arrival time.
For example, type: delta 123 may display this flight information if available.
6 - You can also "Track packages"
Enter a UPS, FedEx or USPS tracking number to get a direct link to track your packages.
7 - Most Common "Pages linked to you" or Link:URL
For webmasters/Bloggers, See what other web pages are linking to your website or blog by typing link: followed by your URL.
For example, typing link:http://always10.blogspot.com displays all pages linking to Always10 - Top 10 List Collection.
8 - Finding PDF results only
Add filetype: to your search to display results that only match a certain file type.
For example, if you wanted to display PDF results only type: "dell xps" filetype:pdf -- this is a great way to find online manuals.
9 - They have "Calculators"
Use the Google Search engine as a calculator by typing a math problem in the search.
For example, typing: 100 + 200 would display results as 300.
10 - Monitor "Stocks"
Quickly get to a stock quote price, chart, and related links by typing the stock symbol in Google.
For example, typing: msft will display the stock information for Microsoft.