HP Pavilion dv6-1030US 16″ Laptop for $599.99 shipped after this $50 rebate and this $50 rebate. It comes with Intel Core 2 Duo CPU at 2.0GHz, 4GB RAM, 320GB hard drive, wireless 802.11b/g/n, DVD burner, and more. The same model with identical configurations usually goes for $749. Note that at 6.93 lbs, it is more like a very portable desktop instead of a truly lightweight laptop. For the other end of the spectrum in terms of extreme lightweight and portability, check this out.
Originally posted earlier, this is just a friendly reminder that it is expiring soon.