I don't understand all these people who want 3G iPads as well as already owning a 3G capable mobile phone/iPhone?
Why are people paying for two data plans?
And as for using the iPad instead of a TomTom... have you seen the size of the iPad. Where on earth are you going to mount it for viewing?
I'll explain to you why

I was sure I would buy a Wifi-only iPad until my operator, Movistar Spain, released their tariffs for the iPad.
Basically, Movistar is the exclusive iPhone carrier here in Spain. So last week they said: for anyone who has the top two iphone tariffs (there are 3: 15,25 and 39 euro), the same tariff will be SHARED with your iPad and they will give you a micro sim card for free.
So, in short: any spanish iphone user with a 25 or 39 euro internet data plans will be able to use the very same plan with their ipads for no extra money. Zero!!
Those on the lower 15 euro tariff can upgrade to the 25 euro and get the same deal.
I'm so freakingly happy with Movistar.. they used to be the worst most expensive carrier in Spain, but now they're doing it right with the iphone. First, the data plans are unlimited data.. really unlimited. The different data plans means you have a certain amount of data at top 3G speeds, and after that you get your speed reduced to 128k but data is still unlimited.
15 eur = 300 mb at 3G speed, then unlimited at 128k speeds
25 eur = 1 gb at 3G speed, then unlimited at 128k speeds
39 eur = 3 gb at 3G speed, then unlimited at 128k speeds
NEXT, when OS 3.0 was released, they announced that ANY iphone user would be able to use internet tethering FOR FREE.
Now, they give an ipad data sim card FOR FREE to those who already have an iphone data plan
