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I spend most of my time working with NetBeans on a mac, and it's just as pretty as Keynote, while more responsive and stable.Just as pretty as Keynote? I beg to differ. NetBeans (and Eclipse, IDEA) always hit the "uncanny valley" for me (and Eclipse is even using Cocoa!). Not looking right at all for the platform, and with BS divergent behaviour on lots of UI controls. On top of it, all three are quite laggy (gotten a little better with huge memory these days and SSDs, but still, if you need 4GB and solid state to get something to run fast, well...).
In no way I would say NetBeans provides a better experience on a Mac than Keynote.