Yesterday I picked up a Verizon MiFi.
It’s a 3g modem and a WiFi router inside a very tiny package. It’s smaller than the iphone. 
And it runs off a battery – about 4 hours in use or 40 hours on standby.
It’s very simple to use. Press the power button and that’s it. The MiFi automatically connects to Verizon’s 3g network and I can share it with up to 5 WiFi enabled devices. I tested it with two macbooks and an iphone at the same time. No issues.
This is going to be a big help on family vacations.
As Jack pointed out, if you see an access point named “Bijan MiFi” you’ll know that I’m around.