Omnigraffle is getting ported to the iPad. This will give the iPad diagraming on par with Visio (well not quite on par, but certainly excellent for 90% of what you'd do in Visio). Omnifocus, my organizer of choice, is also getting the iPad treatment, but that's not the point of this post.
The ability to diagram stuff quickly on a handheld tablet that has a nice wide viewing angle and is easily passed back and forth between people is going to be awesome. To be able to walk up to a rack of computers and create a wiring diagram on the fly, or to quickly draft up an architecture, a flow chart, or anything else without pulling out the laptop to do it is going to be a killer app for me.
Diagramming should be excellent and extremely intuitive on a tablet, I can't wait. Even just having a tablet form factor to look up existing drawings when in the server room is going to be great - there's not always a spot to put a laptop, whereas the tablet can just lay on top of the server or rack or whatever.
I think the most exciting aspect of the iPad is that its going to allow traditional Mac apps to "grow down" to the iPad's size - iWork in this regard is a seminal application because it demonstrates that you can take your Mac application and get it right-sized on the Tablet.
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-Scott
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