1.9.7 seems to be broken on iPhone 3GS devices (see here: http://www.nimblekit.com/forum/viewtopic.php?t=2990). Older, non-broken versions like 1.9.6 are not officially available (developer's comment: "We don't keep older versions").
So better make sure you get your hands on a stable version before buying or tell your users to buy an iPhone 4...
[Version 1.9.7]
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NimbleKit
Acme reviewed on 04 Aug 2011
So better make sure you get your hands on a stable version before buying or tell your users to buy an iPhone 4...