Basically i am after a small lightweight laptop, to use on the train, mostly for work but i may relax and watch the occasional DVD.
I would prefer a small screen, 10.6" ideally, but perhaps a little bigger. I would also want an internal DVD drive...i cant abide plug-ins and they are not really practical space wise on the train IMO.
I am happy to track down something older. I do not really have a budget but as it will not be used for games, graphically it does not have to be great and i do not think it worth the additional cost.
So in summary:
Small/compact/light Screen 10.6" ideally or a little larger Internal DVD drive
Consider the option of ripping DVDs to the hard drive or even converting to AVI files (700mb or so per film) and then the DVD drive only need be used at home or work in the background to prepare what you might watch in the future.