iPhone to iPad Tethering a No Go
Recently Slashat.se reportedly sent an email to Mr. Jobs asking one simple question. "Will the wifi-only version somehow support tethering through my iPhone?" Supposedly Steve Jobs actually replied from his iPhone with "No".
For those that aren't aware what tethering is, it's the ability to share your Internet/data connection from your phone to other devices. In a way, it turns your mobile phone into a portable Internet router.
While the iPhone was suppose to support tethering with the release of the iPhone 3GS version last summer, AT&T still doesn't offer this feature. However, if you have an Android Phone you'll be in luck and should be able to pull this stunt off! For more information on Android Phones and Tethering, visit: Droid Forum - Covering all Verizon Droid Phones & the Motorola Droid
Mobile Broadband Router Solution
I have a 3g USB Modem with Verizon. I use it with a mobile broadband router like CTR500 Mobile Broadband Router | Cradlepoint Technology to create a wi-fi hotspot. I am not a big streaming media type so this works great. I can host up to 5 devices. It is more flexible than a MiFi as it will also connect to a LAN via CAT 5.