The Library Leadership network shares best practice and resources on various topics.  Their read & learn leadership topic includes links to a selection or resources the subject of leadership and developing leadership skills.

http://lln.lyrasis.org/taxonomy/term/8

Emerging leaders Wiki

http://www.emergingleaders.ala.org/leadershiplessons/?p=97

Leadership Wiki with profile of various US library leaders discussing their experiences of leadership in libraries.  The Wiki is part of the American Library Association Emerging Leaders programme, which has run since 2007.  There are various resources supporting the development of leadership skills including a leadership handout, covering principles and practices of leadership with a leadership development action plan, http://wikis.ala.org/emergingleaders/index.php/2008_Emerging_Leaders_Program

Details about the programme are available below:
http://wikis.ala.org/emergingleaders/index.php/Main_Page