I like a light film of Brian Enos' Slide Glide Lite on the rails of my pistols and the outside of the barrel. I apply it with a Q-tip. Everything else gets a light coating of gun oil. I use a large patch folded once or twice and apply the oil to the patch for the outside of the gun. Most say if you can touch the slide with a thumb and it leaves a print you have enough. If I can get to pivot points or the sear with a needle oiler I will place one drop there as well. Sometimes just a drop or two on a Q-tip and a light wipe is all that is needed for some of those harder to reach areas. On the inside of the barrel once it is clean, I pass one oiled patch followed buy one dry patch. This leaves a very light coating of oil enough to reduce any corrosion.
I don't think I have read the above thread yet.