The SBL Handbook of Style: For Biblical Studies and Related Disciplines. 2nd ed. Atlanta: SBL Press, 2014.
More info here.
The second edition of SBLHS is a good and necessary tool for academics who research and write about biblical studies and related disciplines. It significantly improves the first edition, and it will be even more useful when it is available electronically.
Related: I also reviewed another book for the recent issue of Themelios: New International Dictionary of New Testament Theology and Exegesis, edited by Moisés Silva.