Hello,
I carry a Colt CCO, reference above. Reliable, lightweight, and SLIM. When I see a new model of a CCW reach the market one of the first things I look for is the width. The market is glutted with chunky little brutes. 1911s are not the smallest pistols out there but they sure are slim compared to most of the competition.
I occasionally carry an HK P7M8 and a SIG 239, but none of these are what I would call pocket guns. For small revolvers I would consider the Smith line, particularly the versions with a concealed hammer, and the Colt .38 pistols. I like the six shot cylinder of the Colt, but I prefer the Smith's trigger pull.
For small autos I am still looking for one worth a damn. The Sig 232 in .380 is a nice gun- reliable, decent trigger pull, and suprisingly accurate. It also doesn't eat my hands up when I shoot it (unlike the Walther PPK line which will remove skin on each shot). Unfortunately, although it only weighs 16 ounces, it is still too large to be a true pocket gun. Still, a nice rig.
I have considered the new Keltec .380, which really has to be handled to be believed. I don't remember the specs on it but it is TINY for a .380. I am dubious about the reliability of it. I might get one and see if I can break it.
The Kahr line has gotten better, but please shoot shoot shoot it before you trust it. Mine had a host of problems (original all steel 9mm version). Hope your mileage varies. Mine was a very early model and they still had a lot of bugs to work out.
Best of luck in your search,
Cheese
P.S. Don't skimp on the holster end of things- it really matters when it comes to "comfort". You will still end up with a drawer full of holsters no matter what, but they may as well be quality rigs!