This is simply awesome. The MiFi from Verizon lets you carry around your own personal WiFi router connected to their 3G network. What makes it different than a cellular modem card it that this is a router and allows up to 5 others to connect to the same device. Read the article for more.
MORE: Since I posted this I have had the opportunity to test this device. It performs well even on areas with marginal 3G coverage. If you want to test one with no committment to a contract you can rent one for days or weeks. I rented one from Rovair.

State of the Art – With a Private MiFi Hot Spot, Be Online Wherever You Like – NYTimes.com
