Whatever you do, get something light. I made the huge mistake of getting a really great notebook. Powerful, fast, CD-RW/DVD drive, all the latest and greatest. But it weighs around 9 lbs (including the AC Adapter, etc) and is a huge pain to lug around. So much so that I have stopped taking it with me wherever I go. Get something that weighs less than 5 lbs. Or less than 4, even. You will be glad you did. There are many great notebooks out there with Pentium-M processors (anything without a Mobile processor is meant as a desktop replacement, and will be a heavy laptop), long life batteries, optical drives, wireless technology, etc...that are extremely lightweight.
Most definitely get the smallest, lightest thing you can find and can live with. You will be glad you did in the long run.
Just my opinion, and I'm sure you will get dozens more from every possible point of view. Take your time, do lots of research, and choose carefully.