In addition to Martin's alert to the availability of Mozilla M17, Netscape 6 preview release 2 is also available on Netscape's own FTP servers.

You can find it at the Netscape FTP area.

If you download it and give it a go, please post feedback as a comment below. General comments on seem to indicate negativity regarding the install process, general responsiveness and AOL's inclusion of its instant messaging software, etc.