[UPDATE: It's now official.]
Just a quick note - Firefox 3.0 Beta 5 has been released and distributed to mirror download sites.
There's no official announcement yet (I expect this to be made within the hour) but the release notes have been uploaded to the Mozilla website.
Firefox 3 Beta 5 includes more than 750 changes from the previous beta, improving stability and web compatibility, providing platform and user interface enhancements, and resulting in the fastest Firefox ever. Many of these improvements were based on community feedback from the previous beta.
I'll have more on this latest Firefox beta soon ...
[UPDATE: Download page updated.]