Get Firefox 3 during Download Day ( June 17 th 10am US-Pacific Standard Time) to help set the Guinness World Record for most software downloads in 24 hours - it’s that easy.
Go to go to the Mozilla firefox world record site to pledge and download Firefox 3.

Accordign to Mozilla Developer News weblog the final version of Mozilla Firefox 3 will be released on Tuesday 17th June.

"After more than 34 months of active development, and with the contributions of thousands, we’re proud to announce that we’re ready," "It is our expectation to ship Firefox 3 this upcoming Tuesday, June 17th."

[ Coming Tuesday, June 17th: Firefox 3 ]