A Handheld for a Primary Computer?

fromtheblueline asks: "As the last of her children leaves the house for college, my mother is planning on ditching her desktop, cable internet and landline in attempts to simplify and reduce bills. She doesn't use her PC for anything more than occasional emails and online purchases and her cell phone has pretty much made her landline obsolete. She emails me asking if there is a handheld that could replace these devices. I don't own one, don't need one (my SE616 and Powerbook is plenty), and really never bothered to research one. A quick search for anything decent reveals prices close to, or over, a low end notebook. As for access, unless she searches for open wifi points, I can't imagine mobile service being anymore competitive than a cable/DSL line coming into a house. Any recommendations, Slashdot?"