Hermeneia: 1 Corinthians - by Hans Conzelmann (Philadelphia: Augsburg Fortress Press, 1975) This commentary is a masterpiece of honest, thorough scholarship. (The word-count for the footnotes appears to be considerably greater than the word-count for the commentary text itself.) To see an example of the commentary, browse http://www.bibletexts.com/versecom/1co14v33.htm.

Generally the most detailed, useful, and theologically unbiased commentary series is the United Bible Societies' Translators Handbook series. I also very much like the entire Hermeneia commentary series. The International Critical Commentary Series has some really good volumes, as do Black's / Harper's New Testament Commentaries (Harper Collins), and the Old Testament Library (Westminster / John Knox).

There are many, many more books listed at http://www.bibletexts.com/bibliogr.htm. Some other individual commentaries are especially good, such as the ones on the Gospel of John by Bultmann (1 volume), Barrett (1 volume), and Schnackenburg (3 volumes).