"Over the past few days, several release candidate builds of Mozilla Firefox 2.0 Beta 1 have been posted to the bonecho-beta1-candidates directory on ftp.mozilla.org. However, contrary to the indications given by some news outlets, Firefox 2.0 Beta 1 has not yet been released.

In common with many software projects, several release candidate (test) builds of Firefox are made available in the run-up to major milestone releases. These builds are similar, but not identical to, the final milestone releases and are designed to allow the testing community to discover any last-minute problems. Sometimes, but not always, the last release candidate builds are identical to the actual milestone release versions."

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A listing of new features for Firefox 2.0 can be found here at CMS Report.