So, for those who don't like Leopard, why not? And for those who do, what do you like best??

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Leopard is faster, has great key features (e.g. Time Machine, Boot Camp, Spaces, Quick Look, screen sharing and powerful new iChat features), and contains important internal changes that provide faster, easier, and more powerful application development.

The latter means that you'll increasingly see Leopard-only applications.

Go update.