While I agree there might be some secret features as yet unrevealed, the ones which are known are more than sufficient to evoke a great deal of excitement, once they're all shown together. I think Apple has purposely not said a lot about the features mentioned in NaMo4184's post so that they can demo them working together for additional "wow". if you put together everything new to the OS and add in some of the Leopard-specific apps that you just know are coming down the pipe, I think the launch will blow away Vista. Maybe not... but I've yet to hear any sort of resoundingly positive opinions of Vista as a huge upgrade to XP, so I think that Leopard will in fact be able to wow us more than Vista.Keep in mind, these "secret features" must be really really cool, or Apple wouldn't have made such a big deal about Welcome to 2007 and how this will be such an amazing year for Apple.
We'll see.