As far as the actual search functionality the iPad will be incredible. Because the system is OS X based, they have spotlight search throughout the device (like the iPhone does). When I search on my iPhone for a phrase, it checks the meta data/titles of names/locations in address book, application names, music, movies, pdfs, docs. So it indexes pretty much everything.
On my mac I search for the word 'test' for example and have every PDF that contains the word, every file/mp3 with the word in it's meta data, tag or title pop up in 1-2 seconds. Microsoft finally copied spotlight in Windows 7 and it's nearly as good (similar functionality, just slower).
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