by O'Reilly press just released "Team Geek". Instead of publishing my review twice I'll leave you with a link to my review published on sasag.org — http://www.sasag.org/2012/07/20/book-review-team-geek/ — and the advice to go read this book!
This is not a self-help book but it does cover some very useful skills for system administrators (and developers, and network admins, and…) to have. It isn't a technical book, it relates to the other 90% of the job.