Netbooks - the really tiny computers that you can buy for next to nothing for your every day computer needs.
i picked one up recently, one of Asus's EeePC's and i love it!
i reckon these things are the future. they are really compact, light, and moderately powerful for their size. most of them are upgradable to 2gb of ram and windows 7.
depending on the model, they can come with up to around 7 hours of battery life!

mine is the one with the 3 cell battery, so i only get around 3-4 hours. no big deal.
they handle the basic tasks really well. email, web, office stuff etc. and some gaming is also possible. mine even plays WoW! lol
The verdict: if you are looking for a laptop for simple stuff and dont wanna lug around a mountain of computer, i highly recommend a netbook. prices are 280-400.
peace