It isn’t anything revolutionary, it really is just a cleaning up and refinement of everything Leopard – things are a bit more unified, and things work in a more sensible way. Unlike Windows 7, this will not change how you use your OS – it’ll just make using your OS a bit better, a bit faster, a bit easier.
Between the two, all I can say is it’s good to be a computer geek right now.
Too bad Linux is still shitty. :p