There are very few oustanding commentaries on this book, especially compared with the riches that are about to come out in the next ten years or so. Even so, there are a few good ones.
First-rate: Barrett (probably the single best), Alexander, Bruce, Fitzmyer, Haenchen, Marshall, Witherington, Larkin, Johnson, Longenecker. Get also the Marshall edited volume Witness to the Gospel. One should also get Dennis Johnson’s book The Message of Acts.
Second-rate: Conzelmann, Willimon, Polhill, Fernando, Gloag (op), Pelikan
Third-rate: Blaiklock
Forthcoming: Bock (BECNT), Green (NICNT), Porter (NIGTC), Keener, Longenecker (revision), Pervo (Herm), Walton (WBC), Petersen (PNTC), Holladay (NTL)
Conservative: Alexander, Bruce, Larkin, Longenecker, D. Johnson, Polhill, Fernando, Gloag, Blaiklock
Moderate: Barrett, Fitzmyer, Marshall, Witherington, Johnson, Willimon, Pelikan
Liberal: Haenchen, Conzelmann

Jeremy Pierce said,
September 7, 2006 at 7:11 am
I would have put Fernando well above some of your first-rate ones. That NIVAC is one of the best NT volumes in many ways, particularly in thinking through the Bridging Contexts and Contemporary Application sections.