Fair enough. I don't have much experience in hospitals.
But my point remains - a tablet device is less of a replacement for a normal deskop or laptop computer, and more of a mobile specialised information-processing tool. Another application I thought of was for architects or building foremen, so that they can carry about the complete blueprints. Or field scientists, for recording data on the fly. The list goes on. An iPad could fill all these niche markets, depending on how cleverly its apps are programmed. Of course, as you point out, it's not the only available device that can do that. The iPhone isn't the only available mobile phone device either, nor is the iPod the only portable music player.
Not to pile on, as i am a bit late in responding, but there already exists this niche market. My technicians use tabletPC's to collect field data on remote systems weekly. These tablets are far superior to the iPad, in that they run existing apps, i.e. word, excel and custom .Net apps. They integrate extremely well with our existing data collection infrastructure and when not in the field, the tablet plugs into a docking station on their desk and they have a computer available to them.
Best of all, with OneNote, and the handwriting recognition software, they can take great field notes and have those dump right into our database.
Many of my competitors also use this setup. While the iPad is certainly lighter, the fact that it is a completely different OS, non-multitasking and has no real notetaking (via handwriting) capabilities makes this a non-starter in that niche.
Ironically, Apple is not great at bringing out a new paradigm. What Apple excels at is taking an existing tool and making it better. iPods. There was already an existing MP3 player market when the iPods came out, but Apple looked at the situation and created, not only well designed hardware, but via iTunes and the iTunes Store, an entire infrastructure for music downloads. The iPhone was not the first smartphone, but its well designed touch interface and especially the AppStore made it a hit. Even looking back at the original Mac. It was not the first PC, but it was the first to be truly consumer friendly.
The iPad is more akin to the Newton, a novel, new concept, but a failure. While i think the iPad will sell well initially, this is a concept that I believe Asus, MSI, Google, etc. can actually beat Apple.
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