Pal Kerry Ritz tipped me off to the news about 3 and their planned MiFi release later this year.
One of the biggest benefits to using a MiFi is less drain on the PC or mobile phone’s battery vs. being connected directly to 3G. Sure you have to charge two devices, but you can also get power off the PC to power the MiFi with the cord and that keeps both running and fully charged when you’re plugged in and only have one outlet available.
Think about it. In power outlet limited locations like airports you can barter your access to the Internet in exchange for the rights to the outlet.