Replace your rain jacket with a Dri Ducks. Saves six ounces and the thing breathes better too. Ugly, but you're in the woods so who cares. The sizing is weird, as in huge, but in rain jackets I find that coverage over your butt is a good thing. In a pinch DriDucks works well enough for a wind shirt or mosquito shirt too.
Speaking of mosquitos, bring a headnet and make sure your sunhat has a wide brim to keep the headnet off your face.
Add me to the list of people who find wool a bit hot and uncomfortable in the summer. I wore an Ex Officio Air Strip Lite for the first time this past summer and loved it. Made of very light nylon that keeps the sun off and dries in a flash. Again, this is a seriously ugly item, much like the above mentioned DriDucks. I sprayed the thing down with some long-lasting mosquito stuff and it kept the bugs off pretty well.
Bring three pairs of socks: one to wear, one to wash, one to sleep in. Same with undies.
Bring a small pillow case to put your down jacket in for a perfect pillow. The lightest are made of silk (hard to find) and thermarest makes a one ounce fleecy kind that is pretty good.
The hardest section is when you come out of Muir trail ranch and have one hundred and some miles to go with no easy resupply. Depending on your hiking speed this is a 5 to 10 day section. Even though your base weight is only about 12 pounds, your fully loaded weight could push 30 or more for a few days - make sure your backpack can handle it.