Leopard Programming Information Starting To Appear

A couple of sites now have examples of coding under Leopard: a quick Objective-C 2.0 tutorial from Scott Stevenson, a bound NSCollectionView from Kevin Hoffman.

A good place to start exploring what's new in Leopard development is in the release notes at the Leopard dev center. You'll need an ADC membership to get it, but now the free membership works.
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