Michael Goffioul's LISP shell, combining ECL with a GUI based on .NET and RDNZL is now available at the ECL project page. The link is
http://sourceforge.net/project/showfiles.php?group_id=30035
Here is the official announcement
http://sourceforge.net/mailarchive/forum.php?thread_id=30477802&forum_id=1307
and details about how to run it:
http://sourceforge.net/mailarchive/forum.php?thread_id=30484409&forum_id=1307