A few things that stand out for me as great assets that the Mac has over Windows:
- Exposé. This one is amazing. To test it out, open up a bunch of windows (it doesn't matter what they are), then press F9. All your windows will fan out across the screen, allowing you to see all of them and select the one you want. Press F10 and F11 to see Exposé's other two features, showing the active application's windows, and the desktop. I've bound a couple of these functions to my screen corners, allowing me to see my windows with a gesture. This feature is so essential to me now that I'm annoyed with PCs (and old Macs, for that matter) that don't have it.
- Dashboard. To access this, press F12. A group of applications called widgets will glide onto the screen. These can be customized by clicking the i button on the individual widgets, and more widgets can be added using the + button in the lower left. Apple provides several which are useful, and many more can be downloaded. I use mine for my email, checking the weather, and translating between English and French, among other things.
- Application installation and removal. This works completely differently from how it's done on Windows. In most cases, applications are downloaded in the form of a .dmg file, and loaded into a drive image. From there, you simply drag the application into your Applications folder. To remove it, you delete it. That's it. Only rarely do apps have an installer. This one you've got to play with yourself. Download Adium or Firefox as examples to get you going. I prefer this process much more than Windows', particularly since there's no registry on a Mac.
That's just a few.