Integrated GMail is a Firefox add-on which allows you to make the Inbox Collapsible and load your choice of Google Calendar, Reader, Notebook, Groups, etc, plus Custom URLs and Google Gadgets seamlessly into the Gmail interface. It works well with Google Apps Accounts and GMail Themes also. With this add-on you can easily have more than one Google Service inside the Gmail account.
Google Reader inside Gmail
Google Calendar in Gmail.
Collapsible view of Gmail with Reader and Calendar.
The add-on is an experimental one, so you will need an account to download it. This add-on is really useful for people who use multiple Google services like Gmail, Calendar, Reader etc and the best part is the support for even Google Apps account.
You can add calendar, Reader, Notebook, Groups, Maps, Picasa, Sites, News, Portfolio, Custom URLs and Google Gadgets into Gmail. We were able to load our mail service from Google apps and Google reader from normal Google account into apps account. This add-on is worth a try for all Gmail users. It works well with Firefox 3.0.