Forget IBM.
The IBM of yesterday was an IBM, and they were the best.
The IBM of today is, er, not an IBM as you know it. (Third party)
I agree that brand loyalty in laptops is foolish, as they all use more or less the same stuff.
However, I always buy Dell Inspiron notebooks with the two or three year Next Business Day on Site Warranty.
Those particlular warranties ROCK. They come to YOU, next day, and fix it, PERIOD!
I am not loyal to Dell computers so much as I am loyal to their customer service.
Be advised: Their low priced, Return to Depot warranties are run of the mill, and you might as well get a generic.
My recs: Get a Pentium M chip, end of story. Pay for a larger hard drive, but do not pay for extra memory. 256mb is fine for most, and an extra 256 is cheap and easy to install yourself.
Get at least a DVD/CDRW combo drive (pretty standard these days).
Without either of those features, you'll be lost.
Just my .02