Litephone
From Openmoko
Litephone is a phone application using FSO. The basic idea behind the Litephone GUI is that it is packed in one window, the various 'modules' (contacts, messages, dialer, etc) placed into tabs. No popup windows.
Announcement: http://n2.nabble.com/testing-Litephone%2C-new-phone-interface-tp3336730p3336730.html