A buddy of mine has a .380 Kel Tec and it is a great little pocket pistol. Very light and easy to hide and carry. I carry the North American Arms Guardian in .380 and I love it. The Guardian is all stainless steel, so it is a little heavier than the Kel Tec, but it still carries nice for me. I carry mine in a left handed rear pocket holster as a back up to my main EDC pistol (Para Ordnance C7-.45 LDA).
There are many pistols out there that will work as a pocket pistol. For some folks, the Kel Tec's, Guardians, Beretta Tomcats or Seecamps the perfect size. For others, the Walther, Sig 230's or Glock 26's and 27's will work. Still others prefer the 2" revolvers. It will depend on how well you shoot with it and how easy it is for you to carry it. It also depends on the environment where you live. Will you be carrying at work as well as just around town? Climate and common attire have a lot to do with what you can get away with. Can you get away with wearing an untucked shirt or a lightweight vest to cover your handgun all the time?
There are those who will try and tell you that nothing but a full size pistol is what you should carry all the time, but the reality of it is, you will carry what is comfortable for you. I would venture to say that there are times (more than most will admit) that the big guns get left at home and the smaller pistols are carried as the primary sidearm.
The bottom line is that carrying a pistol....any pistol takes some getting used to, whether it is concealed or not. You should always have a gun (any gun) with you at all times if you can......