I have an Acer netbook (a little over 2#), and I have found it to be so handy for so many things, I don't mind the little extra weight (all my travel information is on it, I keep an ongoing account of my expenses and the amount of money I need to finish the trip, store and organize my photos as I go, send emails to friends and relatives, pay bills online, post my travel on my website, keep a journal, etc). But I wouldn't want anything bigger. The netbook goes in a case with important papers, and I always keep it with me (I doubt that it weighs more than most women's purses). I'll often take it out at lunch and review my plans for the rest of the day.
I've been looking at an Asus Transformer tablet with a detachable keyboard. I could carry the tablet during the day and use the faux keyboard, which I hate, only rarely, then attach the real keyboard when I'm in my room at night and want to do real work.