Gmail is part of Google Apps, the Internet giant's software package that includes e-mail, calendar, documents, spreadsheets and sites (a wiki). Anyone can get a free Google Apps account by singing up for Gmail, while businesses can buy a premier edition for $50 per user per year.
Google has added new features to its Gmail service during the past couple months that make the Web-based e-mail service more business-friendly and versatile. Here's a look at free add-ons that could really improve your usual Gmail routine.
You can install the following add-ons with either version (free or paid) of Gmail. To add them, you must first go to Gmail Labs. To access Gmail Labs, click on the green beaker in the upper right hand corner of your Gmail inbox (it appears next to the "settings" tab).
1. Offline Gmail :
With offline Gmail, you can write and read e-mails. Messages that you compose while offline will be stored in your outbox and automatically sent next time you connect to the Internet.
2. Gmail Inboxes :
This tool basically adds more inboxes, or window panes, to your main Gmail inbox. These boxes can contain e-mails related to frequent search terms that you use. You can also match them to labels that you create to help organize your Gmail messages. For instance, if you have a label for "Travel," you can create a pane that lists your travel messages. This add-on can be helpful if you're hoping to have a front-and-center visual of certain e-mails and don't want to have to keep searching for them.
Source: Cio.com