What book do you recommend on software development methodologies (or on a specific methodology) that good for project managers? So I'm looking for a book that overviews methodologies from the aspect of a PM not a developer.
I recommend PeopleWare.
Also have a look at Book Reviews article.
The Mythical Man Month
It explains in details (what most PMOs fail to understand :-)) :
"adding manpower to a late software project makes it later"
Read No Silver Bullet, for an insight into why any general methodology is not going to solve your specific problems.
I assume you mean development methodologies (e.g. SCRUM, Waterfall, XP) as opposed to project management methodologies (e.g. PRINCE2)?
Extreme Programming Explained by Kent Beck is a pretty good, very straight forward book on Extreme Programming, one of the most agile of the agile methodologies.
Agile Software Development with SCRUM by Ken Schwaber or Succeeding with Agile: Software Development Using Scrum by Mike Cohn are both pretty good SCRUM books.
The Rational Unified Process Made Easy: A Practitioners Guide to the RUP by Per Kroll is a pretty good Rational Unified Process book.
It depends on how much time you have and how much you want to learn. I can't think of any particular resource that surveys different processes - just books that go in-depth on a particular method or best practices.
I can list a few books.
I think Gerald Weinberg also wrote a book related to the topic but I can't seem to find the particular one I am thinking of. It had a blue cover if I recall.
There are lots of others of course, but it really depends on what you want to get out of it.