We’ve had 3 students, Laure Chivot, Franck Duchi and Mathieu Talibart working on improving phpGroupware’s user interface in the admin module, trying to use AJAX techniques.
They’ve achieved some encouraging results using the Yahoo! UI Library (YUI).
You’ll find some screenshots of the results here.
All they have developped is archived in a project on Picoforge at GET/INT (phpgwadmin project), waiting for more work and maybe integration upstream.