Using the new http://Xamarin.com wrapped assembly for Flurry (thank you Xamarin) I am porting my apps that used the old binding to the new one.
Where do I set the Flurry API Key for the app?

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The API key is set in the FinishedLaunching method in the AppDelegate, and should be called before any of the rest of the delegate code:
Check out the sample for some decent coverage of the API usage:
https://github.com/mono/monotouch-bindings/tree/master/FlurryAnalytics/sample