You can take pictures of your computer's surroundings combined with screenshots, create a Powerpoint-esque presentation from those pictures, set it to music of your choosing, export it to Quicktime, transfer it to your server, post an appropriate encrypted blog entry, alert various people in your address book by email or phone (and giving them the decryption key), mark the event in your calendar, and watch it on your television in Ohio (with your computer sitting in Venezuela)... all by speaking instructions to it over the phone.
I think the question should be:
"What can you do with a Mac?" 🙂