If you are interested in management and leadership topics related with an agile and lean mind set, I would recommend the following books for reading.
Jurgen Appelo, Management 3.0: Leading Agile Developers, Developing Agile
Leaders, Addison-Wesley Professional, ISBN-13: 978-0321712479, English, see: http://www.amazon.com/Management-3-0-Developers-Developing-Addison-Wesley/dp/0321712471.
There are many reviews on Amazon to read, so my personal review would not add anything
Uwe Vigenschow has written three books about social skills. The first one for developers, the second one for IT-management and IT-project manager and the third one for consultants. Unluckily the books are available in German only. I recommend these books as they are good to read, investigated very sound and pragmatic. No esoteric highflyer smalltalk. See: http://www.vigenschow.com/Publikationen/Buecher/buecher.html