I know I'm very late posting this, but since this is so significant (and I happen to have a slight bit of free time right now), I wanted to post the news here.
For anyone who may be unaware, Firefox is basically a stand-alone version of Mozilla's web browser. However, Firefox has been greatly enhanced, supports a ton of useful new features, and can be easity extended with any of the hundreds of extensions and plugins available for it.
Similar to Firefox, Thunderbird is the stand-alone version of Mozilla's mail client and address book. It has also been greatly enhanced, and is officially (by my standards) one slick e-mail client.
Here's a compilation of useful links for both Firefox and Thunderbird. If you haven't tried either Firefox or Thunderbird yet, please give it a shot. Trust me, give it one week, and you'll be thanking me for turning you on to it.
Firefox Home Page
Firefox 1.0 Release Notes
Firefox Extensions and Themes
Switching from Internet Explorer
Thunderbird Home Page
Thunderbird 1.0 Release Notes
Thunderbird Extensions and Themes
Why You Should Use Thunderbird