Ask HN: are there any "must read" product management books?

I'm looking to get some fresh ideas to improve our product lifecycle. A quick Amazon search turns up a lots of stuff, but I'm not sure which books are for us - in particular, even if the book is very good I am not sure if it is targeted towards say enterprise vs. an small, everyone-wears-multiple-hats agile team. With software development you've got "must reads" like Code Complete that basically are relevant to any programmer regardless of environment, so I wonder if there's analogous tomes for product?