The Valve company handbook (download), about the post-industrial method of management.
The on-purpose person, free ebook until the 28th.
And some recent posts on The Domino Project blog (though we're not publishing any new books, the blog continues).
Bonus: a new (short) TED talk from Nancy Lublin. Does changing the medium change the message?
(Plus, a new one from Hugh, not free, but still a bargain…)