Hi,
we have done a prototype in a UIWebView too (the touch handling is done in a overlay UIView that is calling the underlying JavaScript).
There are two solutions for a smooth and fast pane/zoom:
1) Caching the tiles loaded from google / virtual earth
2) Writing a own tile server and own pane/zoom in a simple UIView
Both are not simple to implement - we are on the way to do the first solution - the second is very hard to realize (you have to implement most of the javascript functions via objective-c)
Cheers
Ralf
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