Big 4 and clothes were in earlier threads.
Cooking: .9L non-stick Evernew Titanium pot, esbit tablets, Gram Cracker esbit stand, Caldera cone stand/windscreen. I was VERY happy with this system. The Caldera cone is fantastic. The esbits work fine if you're not doing anything fancy (i.e., you're mostly just boiling/simmering). But I didn't cook much at all, and I sent my cookset home halfway. If you are doing the PCT, you might consider going stoveless. It takes weight and volume away from the pack, and lets you carry less water. I felt sick each time I ate an entire noodle pack or mashed potato pack.
Water treatment: I used Aqua Mira or chlorine dioxide tablets. I got tired of the AM taste. If you have money, the tablets are lighter, easier, and taste better. They are pricy though. I didn't treat a lot of the high mountain water, or springs I could see coming out of the ground.
headlamp: Petzl E-Lite. For me, I would want something a little stronger for night hiking. I don't night hike much, though. Photon backup was great.
Pack liner: trash compactor bag. worked great. I have found most/all pack covers to be not very effective.
First aid kit: had a fair # of things in the kit, but I only used Advil, a couple small bandages, moleskin, and tape. There is this non-sticky stretchy "tape" with kind of a fabric-y feel, like stretchy gauze, that was great for holding moleskin on blisters. Any sticky tape I used, including duct tape, would come off when it was wet. The stretchy gauze never came off--just wrap it once or twice around the foot so it sticks to itself. Brand name of mine was "Cohere".
A headnet was great even if you don't use it for bugs. I used mine as a light ditty bag to hold my other small ziplocs. Easy to see where everything is.
Poles: Black Diamond Ergo Cork. Everyone who had cork handles was glad they did. My grips were tilted, which was easier on the hands. I never had any problems with the locks. Lots of people had carbon poles and lots (most?) of them broke a pole at least once. The carbon ones were a lot lighter than mine though. I didn't really feel the extra weight. YMMV.
ground sheet: Tyvek. I put grommets in the corners so I could stake/pole it as a sun shelter if needed. My desert section wasn't very hot though. I would write the name of the town I was hitching to on my folded Tyvek.