I tend to go lightweight for summer trips, midweight for winter. I'm much more nervous then about having the right cold-weather gear, as well as dry clothes. In the summer, though, I'll just take the minimum that I need - one warm layer, a shell, crocs.
I'm also a fan of the external-frame backpack. My big old Kelty external is much lighter than my 7lb Osprey internal, and so whenever I can use the Kelty I do.
I'm currently trying out even using lighter footwear. I'm a consumate fan of the Asolo FSN 95 GTX boot, which is light to begin with, but recently I've been wearing Merrill Pulse II's, which are more like overgrown sneakers with a Vibram sole than boots, and I like them.
The exception is food. I have over time learned that having real food is worth it to me. I might bring a package of noodles that weighs nothing, but also a tin of chicken and some baby carrots to mix into my soup. I like to take fresh hummus, cheese, and will even take a small bunch of grapes for the first day.
One time, we even brought lamb tips marinating in a ziplock, and skewered them over a tiny fire at our backcountry campsite. Mmm-mmm!