Update! Thanks to contributing members!
This is more important now than ever.
Airports WITH body scanners:
ABQ (Lane 7, on the far right side of the checkpoint when facing it. Use lane 1-6)
BWI (A,B,D concourse no way to avoid them but not primary)
CLE (Concourse A no scanners. Concourse B two scanners; TSA tells you where to go or not. Concourse C lanes 6&7 have scanners; can be avoided by choosing other lane.)
DCA (are they still there?)
DFW (only Terminal D, checkpoints 18&22)
IAH (Terminal E but you get choice of lanes)
IND (both A and B concourse on checkpoint 3, choice of lanes with no scanner)
JAX (1 scanner, avoid if taking the TSA line to the left, the two lanes on the right funnel to the scanner)
JFK (not on the TSA list but somebody mentioned it)
LAS (That new A/B/C checkpoint upstairs has it. Not primary. The old C checkpoint by the train does not have it.)
LAX (T5 checkpoint - DL/NW concourse+AeroMexico. Use T6 instead and take underground tunnel to T5)
PHX (only in checkpoint B & D at terminal 4--not primary at the D checkpoint. I don't think I've even seen it to be honest.)
RDU (only in T2 and not as primary)
ROC (apparently not yet in operation but machine is there)
SFO (In international terminal, primary but optional. None at T1 Gates 20-36, domestic.)
SLC (T2 (DL) but not T1)
TPA (Airside A and Airside E checkpoint - AC/DL/NW/UA)
Airports WITHOUT Bodyscanners:
JFK in DL terminal 2/3.
LAX (T1 WN/US, T3 AS/VX)
ORD (not on the TSA list, T1 definitely clear)