Notes for Gmail is an extension for Google Chrome (and eventually Firefox) that allows you to add those special notes or instructions to each of your e-mail messages. Not only is this extension designed to implement a feature Gmail is missing, it also leaves you without fear of accidentally sending off your added notations. However, there's one catch: it's in private beta at the time of this post.
With chrome extension you have option to add special notes or special instruction to your each e-mail. If you got a mail from your wife that you have to pick her up from shopping mall at 5 PM you can add special note or instruction on that mail with this Note for Gmail chrome Extension. This is still in beta mode and developer has only invited 2000 people to use it.If you are the one lucky try that you are getting it or not. If yes than you first download and install in chrome. Once you make it onto the Notes for Gmail sign-up page, fill out the necessary information. You'll need to verify your e-mail address at some point to be able to create notes so make sure you provide a real one.
After you're done, just click the Submit button and you'll see a welcome page for the beta. Don't leave this page (yet)! All you need to look for is the link in "Please click here to continue" so you can get to the download area for the extension. If you're in the first 2,000 beta sign-ups, ignore the rest of the text on the page.On the download page you'll see instructions for installing the extension. For users on Chrome 21, you'll need to manually install the extension by dragging it from the download location to the extensions page. If you're on a Chrome version 20 and below, it will let you install right from the download. Instructions for both methods are included on the Web page.
Next you'll need to log in to your Gmail account. If the extension is installed properly, you should see a pop-up asking you to sign in with and grant access to your Google account so you can add notes to messages.With the extension authorized, reload Gmail and click on an e-mail message. You'll see an Add Note button along the top, which will open a text area for you to type. And that's it! Now you're ready to keep notes on all of your conversations so you always know what's going on.