Galatians is loaded with good commentaries. For those who do not want a technical commentary, Scot McKnight's work in the NIV Application series is quite good. Two of the better evangelical works are by F. F. Bruce (NIGTC) and Richard Longenecker (Word). A New Perspective take on Galatians is present in J. Dunn. He also has doen a Theology of Paul's Letter to the Galatians. These should get one well down the road in this key book of Paul and the issues tied to Christianity, Judaism, and Law.
Galatians - Sept 14