I'll throw in an endorsement for the iBook app. I read a couple of pdf's of photocopied articles using iBook and it was able to do some limited searching of text that my laptop can't for scanned articles. It's limited, and seems to work better on pdf's that are scanned more clearly.
Has anybody found an app that is comparable to Google SketchUp? They have not developed an app for this tool yet, and I have some Google SketchUp enthusiasts that would like to be able to manipulate their sketches in ways similar to how they are able to navigate in the GoogleEarth app. I searched and found a lot of drawing apps, but nothing in which you can build and manipulate geometric forms aside from $20 CAD programs which I hear are a bit much to learn.
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