From mozillazine.org :
"Mozilla 1.4 is now available for download! This release offers several enhancements over Mozilla 1.3.1, including NTLM authentication support (Windows only), bookmarks improvements, click-and-drag image and table resizing in Composer, smooth scrolling (disabled by default), junk mail improvements and proxy auto-config failover. See the new-look Mozilla 1.4 Release Notes for more information and grab a build from the mozilla1.4 directory on ftp.mozilla.org.
The Mozilla 1.4 branch is intended to replace the 1.0 branch as a stable baseline for developers to build upon. It is the basis of today"s Netscape 7.1 release. In future milestone cycles, changes will be made to both the Mozilla technology and the project"s organisation, including a move towards the standalone Mozilla Firebird and Mozilla Thunderbird applications as the main focus of development. See the Mozilla Roadmap for more information."
Equally mozillazine.org also reports that Netscape 7.1 has been released; its based around the 1.4 code base.