FWIW: I'm a geologist, and am often in areas w/o any available coverage; I've GeoXT's and Juno's and Recons w/ a ProXH; while I'm used to ArcPAD 7 and 8, I more often am using TerraSync. I've just gotten an iPhone, and would love to be able to store map data on the phone for use when out of coverage. It makes a lot of sense, for mapping purposes. Another vote for being able to cache data for use.
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