Gmail, Google's popular Web mail application, is already full of useful features all on its own. But Firefox users can further customize Gmail with a variety of add-ons. Some only change the appearance, while others add functionality that makes Gmail more like a personal planner than just a plain old email application. Let's take a look at three Firefox add-ons for Gmail.
Every Geek uses Gmail... it's pretty much required. And now you can set Gmail as the default client in Ubuntu without any extra software. (Windows requires the Gmail notifier be installed)