My first preference is the Ruger LC9, or S&W 2 inch J frame, both with lasers. Mostly though both are just a little too large for my pockets.
I usually pocket carry the Ruger LCP/Crimson Trace laser.
These all work OK for pocket carry and sometimes I'll just grab one of them.
Beretta 21 (22LR) or Beretta MINX (22 Short).
Micro Desert Eagle.
Kel Tec .380 or 32.
North American 22 Mag revolver.