Commentaries

1 Peter (Hermenia) By Paul Achtemeir
1 Peter (Anchor) By John Elliot
First Peter (NIV Application) By Scot McKnight
2 Peter, Jude (NIV Application)
By Douglas Moo
First Epistle of Peter (NICNT) By Peter Davids
Letters of 2 Peter and Jude (Pillar) Peter Davids
Letters and Homilies for Hellenized Christians, Vol 2 (1-2 Peter) By Ben Witherington
Letters and Homilies for Jewish Christians (Hebrews, James and Jude) By Ben Witherington
Early Christian Letters for Everyone By Tom Wright

General
IVP Dictionary of the Later New Testament and its Developments By Ralph Martin