It is alive! You no longer need to get a pre-release version of Nmap to get the topology mapping utility. That's right, Zenmap (the graphical Nmap interface) can now literally draw you a picture of your network. There are also multiple performance enhancements in the latest version, many based on developments made during Fyodor's "Scan the Internet" project.
Zenmap will not replace the command-line version of Nmap for daily use, but I will occasionally have a real reason to use the GUI now.