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Facetime's wifi restriction is a software limitation, and not imposed by the carriers. I suppose it's possible that Apple could release a new version of Facetime that supports video calling over mobile networks, but that's pure speculation.
And yes, there are ways to make it work over mobile carrier networks on a jailbroken device. These are hacks however that fool facetime into thinking the mobile network is actually wifi.
Baraka, I have four devices because each one fulfills a specific purpose, and that was kind of my point. My desktop is a purpose-built hardcore gaming machine, the media centre is designed to integrate with my home theatre system (such as it is), the laptop allows me to do light duty surfing from the couch or the bed (as well as being a work machine, since it's running Fedora) and my Nexus One gives me internet access and some very light computing (mostly via SSH) from nearly anywhere. Each one has it's uses, and I use each one at different times. It's rare for me to go more than a day without spending time on each device.
I don't see a place for an iPad in any of this. And, in fact, I'll take it a step further -- I don't see anything an iPad can do that can't be done better by something else.
And that's why I don't recommend them. They're hyped up to hell and gone, but at the end of the day, they're just not that useful -- especially not at a $500+ price point.
I'd actually be interested to hear from an actual iPad owner. Any takers? How long have you had it? What do you use it for? How much time would you say you spend with it in a given week? Getting answers to those questions from people with much more practical experience than I would be most enlightening, I think.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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