I have no proof of this
If I had to guess at what might be possible with .mac I could come up with a few ideas.
1. Shared iPhoto albums. You would be able to maintain a family album with multiple people on a .mac account. No need to send relatives photos because they will all be available to the whole family.
2. Shared iTunes. This would be different, you would only be able to stream music over the internet and only to another .mac authorized user. That way you can't steal music.
3. More complex web page designs and technologies that allow a user with minimal skill to come up with a very good looking site.
4. Virus protection like PC users have. You go to a web page and the web page will scan your disk for bugs.
5. Automatic software updates for ALL of your applications.
6. Discounts on OS upgrades.
7. Extra themes, desktops, icons, screensavers.
8. Ability to keep your PDA updated with emails and such when you connect it to the internet.
9. Ability to remotely administrate your computer.
10. Ability to make the computer at your house be used as a web server without having to worry about changing IP numbers. No need to register a domain name. It will be your .mac nickname @ .mac.
11. They might give you access to vast quanities of knowledge and information. Like, all that music for iMovie they had online once. Well, they could have things like that for iDVD, iMovie. They could also give you access to electronic books, live concerts. Or they could take their idea of Quicktime TV and make it what it was supposed to be, a way for you to watch television on your computer. It would not be like tv, it would be shows or news that gets updated once a week.
Just more of the same, but different.
