Below is a list of leadership web sites that can serve as resources.
The Washington Post Online
Forbes Leadership
Center for Creative Leadership
Leadership Now
National Clearinghouse of Leadership Programs
International Leadership Association
Leadership by James MacGregor Burns
A seminal text that introduces a new understanding of leadership

Leadership: Theory & Practice by Peter Northouse
An exceptional examination of the broad range of leadership theories as well as their potential for use in real-world environments

Leadership for the Twenty-First Century by Joseph Rost
Re-conceptualizes leadership today as it traces historical roots, includes ethics as core component

Exploring Leadership: For College Students Who Want to Make a Difference by Susan Komives, Nance Lucas and Tim McMahon
Defines leadership as "a relational process of people working together to accomplish change or to make a difference that will benefit the common good." All students are encouraged to be a part of that process, whether as a formal leader, or an involved, committed group member.
The Leadership Challenge by Jim Kouzes and Barry Posner
Describes five leadership practices which are grounded in extensive research with leaders at all levels in public and private organizations.