Interesting notion...
First, while it's just a PDA and can't make calls, I have a Sony Clie that I got for Christmas in 2002 that I can use as a remote control. It just uses the IR port that you use to communicate with other devices. Nothing really groundbreaking there.
I suppose I'm showing my Luddite tendencies, though, in thinking that having all my personal data available on the web is NOT a good thing. My PC at home, while hooked to to the web via a broadband connection, can be turned off, and while it's turned off, I can be pretty confident that no one's hacking into it.
The previous note talked about the sale of personal data to advertisers, and that's just one way your personal data can be used (my gosh, I'm really starting to sound like a nut-case conspiracy theorist), but, it really does get down to presuming you have a degree of anonymity when you're out and about. I can walk into a store and buy something, and, if I pay cash, no one knows who I am (I tend to either tell cashiers that, no, they can't have my zip code or phone number when they ask, or, just to be troublesome, I make up zip codes and phone numbers - try giving them a 6-digit number and insisting that you've lived there for 20 years and have never had a problem with that zip code anywhere else).
But I digress. I want to own my media. I want to have physical possession of it. I like to read the liner notes, admire the artwork, swat flies with it. But I also like the fact that if the cable connection goes down, I can still watch a movie or listen to music.