here is a spreadsheet all can use....
i have used a tarp for a long time....never had any issues, even in wind and rain, it is a poncho tarp. i think that is one of the best ways to save weight, take things that have more than one use. I use torso length sleeping pads, and use my bag to insulate under my feet. Also quilts are a good way to save weight, i have used one on my last three trips (golite ultra 20), and it is fine.
I recently bought a down jacket (western mountaineering flight jacket i think) to replace my fleece. It saved a few ounces.
Mule ears was right about the stuff sacks, if you have 4 4 ounce stuff sacks to organize your stuff, that is a pound.
i dont count the clothes i wear in my pack weight, even though i think you are supposed to, but i just use cheepo nylon pants now instead of my zippoff pants, and roll them up if i am hot, and, don't tell anyone, but 1.99 (for 5 pair) womens nylon socks, and a polyester shirt.
my montbell wind jacket weighs 2.6 oz, and is great, just buy a size bigger if you get one.
and i do use a homeade alcohol stove, it weighs 1 ounce, and i usually take about 8 oz of fuel for a 2-3 day trip. my feind from colorado takes an altoid tin, and puts wood it, and that is all he uses, but it takes him much longe to boil water than with an alcohol or canister stove.
sorry about the rambling