The new msfgui is now in metasploit; svn up your msf3/ directory to get it. There is also a good review at http://www.darkoperator.com/blog/2010/7/14/metasploit-new-gui.html Initial reception has been good, although a few bugs have popped up.
It supports most scripts and most options on them via a right-click menu on a meterpreter session, generates a basic log report containing every command given and all received data on each session, supports generating and encoding payloads, a recent modules history to quickly relaunch saved modules, unique hash collection, and more. And it's still under development, with many more ideas for future work.