Mozilla 1.4 is about to have its third release candidate. I expect the builds to go live on Monday. Between now and then I've got some release documentation to do and the build folks have to repackage the bits for the release. In the mean time you can get a sneak peek at the builds which will very likely become Mozilla 1.4 RC3 early next week (and which I hope will become Mozilla 1.4). Mac, Windows, and Linux.
There are several important fixes since the second release candidate, including a fix for the major memory leak that was impacting win9x users the most, and several Mac OS X fixes including one for tabbed browsing context menus, one for typing problems on flash sites, and a new application and documentation icon set :-)