On a laptop screen size doesn't matter. In College when living space was limited I used a 13 inch 9 pound laptop that I'd lug everywhere since I needed the portability and performance. I then switched to a desktop with 6 cores and 8 gigs of ram as my main machine with a cheap netbook that I use when I'm traveling or want to do basic browsing or email from the couch. When I give into gadget lust or get a big enough raise that I don't feel so guilty spending $1500 when I still have two working computers I may get an 11 inch MacBook air with 8 gigs of ram. Ideally I'd prefer the 11 inch form factor but until recently I couldn't find an 11 inch laptop with good enough specs to be used as a main machine. As far as the phone goes the only touch screen phone I’ve ever had is an iPhone 4 so don’t know how screen size on phones would matter to me. I do know that on touch screen devices too much space can cause me issues since it’s hard to remember where things are. After playing with an iPad I decided to stick with an iPhone since it can do pretty much everything the iPad can without having so much screen space that I spend most of my time trying to find icons instead of the space separating them. I have heard of blind developers using iPads to get a spatial layout of web pages when they are doing web development. For that purpose I could see the bigger screen being an asset but since I don’t do much web development it’s not something I care about.