10 Essential Gmail Hacks and Add-ons!
Top Five Gmail Lab Add-ons
For all of these features, you can find them by clicking on the Settings link at the top of your Gmail window and selecting the Labs feature tab.
Undo Send
Ever had that e-mail you sent, but wish you had back? This is where Undo Send comes into play.
When you enable the Undo Send feature, you will have a few seconds to undo the sending of the e-mail. Just click the Undo button presented at the top and the e-mail will stop sending. Be aware that Undo Send will only let you un-send the message for a few seconds.

Canned Responses
As you know, canned responses are responses that you can send automatically.
If you send similar e-mails to multiple people and do not feel like copying and pasting, this is an excellent feature for you.
After the Canned Responses labs feature is on, click on Compose Mail. Click on Canned responses and select new canned response.
Name the canned response, doesn’t matter what you name it, but remember the name so you can use it in the future.
Start typing your canned response. When you are finished, click on Canned responses again and under Save click on the name of the canned speech. When it asks if you want to overwrite, click Ok and it will save your canned response.
Canned responses can also be used when you have to change the name of a person or building, for example. Just change the name of the person before you send the e-mail.
Snakes with Shortcuts
If you like the game Snakes and want it in Gmail, this Labs feature is for you. If you haven’t played the game Snakes, yet want to do something in your spare time, this feature is also for you.
You need to enable Custom keyboard shortcuts and Old Snakey.
After you enable these two Labs features, you should be able to press Shift and the 7 key to launch the game.

Mouse Gestures
Constantly clicking the mouse when you need to go between e-mail messages gets rather tedious. With Mouse Gestures, you can slide the mouse and automatically advance to the next e-mail.
To make this work, you need to enable the Mouse Gestures labs feature. Once it is enabled, just hold down the right click button on the mouse and slide your mouse in the appropriate direction.
Down = Return to Inbox menu
Right = Advance to next e-mail
Left = Return to previous e-mail
Text Messaging (SMS) in Chat
If you hate the tiny keyboards provided by most cell phones, you will love this feature. When you enable this labs feature, you can send a text message to any of your friends using the Gmail chat feature.
To do this, just type in the number into the chat window and click the Send SMS button. Fill in the person’s name and then send the message. The person will get a text message from the text you typed. Be careful on how many times you click enter though, each time you do the person will be charged.
Now that we've showed you some of our favorite features, you should know how to get the most benefit from Gmail account. If we overlooked one of your favorite hidden tricks or Labs add-on, leave us a message in the comments below!