I was looking through my files recently and came across this survey from Sermon Central dated November 2006. Preachers were asked their favorite New Testament books to preach. Here is the top five according to the survey.
1. Ephesians (16.8%) 2. John (12.2%) 3. Philippians and James (both at 10.7%) 4. Romans (9.2%) 5. Mark and Hebrews (both at 6.1%)