CD's - first off, as a media rat, i want them. i have a couple album downloads, and while its kinda neat, two will be rebought on cd as i like the albums and thus would like a physical copy with the album insert in the cd. you don't seem to get all that with all your downloads (lyrics, thank yous, band notes, write ups and art are as important to me as the songs themselves) using it to download a song or two from a random artist is one thing, but i will never buy entire albums downloads again.
DVD's- i like to share movies. me and dad have a large collection. and we often loan them out. and, same as the CD's, i want a physical copy to have, with the art/cover/notes, even if DVD's are less involved then the CD's.
textbooks or, any book, for that matter - if i wanna read something on a computer screen, i'll read whatever i find on the interwebs. if i want to read a good book, i want it on paper. i like the feel and smell of a book, be it old or new, paperback or hardcover. as for textbooks, i like haveing something i can pick up and flip through. i never sold any of my textbooks back from college, and even still have a few HS textbooks that i forgot to give back. if i need referance, i go in my room and look on the shelves, and i can find two or three likely canidates to have the info i want all at once. also, while in college and even now, i will have two or three texts open at once and spread out in front of me, using all at the same time. with an e-book i wouldn't be able to have that. i would have to stop and do something to have the pages and books flip to the right info.
smartphones- ok, thats one i could go for.
landlines- ha! i'm still in the dark ages up here. i'm using it right now, as i still have dialup and dad doesn't have a cell phone. even if he had one and i had some other form to get on the internet, we would still have the landline. it don't go out with the power, and cell service can be spotty up here.