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In addition to a removable battery, Droid also comes with a 16GB microSD card - two major omissions on the iPhone. The microSD slot it poorly located though, requiring the removal of the battery to access it.
My very much used iPhone 3GS next to the brand new Droid. The Droid is slightly larger than the iPhone and weighs more (6 oz. compared to the iPhone's 4.8 oz.)
The iPhone 3GS stacked on top of the Droid. Right profile.