I don't really feel like I'm bringing that much stuff - it's just that the laptop and the digital camera and all the cables and accessories add so much weight. I'd estimate that as at least 10 pounds of the total. Unfortunately I can't ditch the laptop as I'm going to be writing and researching for this candy project.
I've further reduced the clothing, dropping 1 pair of socks, 2 of the long sleeve shirts, and 1 T-shirt. I really don't want to reduce the underwear count

The jacket is relatively small - a Marmot Precip women's rain jacket. I actually can fit everything in my backpack (including my laptop and camera case) and lock everything up - volume isn't an issue. I just wish I could get the total weight down.
Other things I'm bringing:
Ipod nano
Headphones
Canon SD400 Elph camera + accessories (backup to my Nikon D40 SLR camera)
pack of DVDs for burning photos
3 Eagle Creek 1/2 cube packing cubes (all clothing fits in here)
headlamp
notebook (moleskine), pens, tape, glue stick
Guidebook: Footprints Central America guide
travel towel
silk sleep sheet
toiletry bag (with travel sized toiletry items, divacup)
cable lock + zipper lock
sunglasses
laundry kit (clothes line, sink plug, soap)
plug adapters
small first aid kit (bandages, advil, bug bite stuff, duct tape)
1 pair sandals
1 pair hiking shoes
6 months contacts
What is a good weight for a solo female traveler carrying a laptop + digital SLR to aim for?