This article adresses some of the major themes of Sefer Shoftim: 

1) The limitations of the great conquest of Yehoshua and the need for ongoing inhabitation of the Land 

2) The unified national model of leadership versus the local tribal leadership model 

3) The less direct means of communication with God during the period of the Judges.

Courtesy of the Virtual Beit Midrash, Yeshivat Har Etzion