We use Verizon Wireless Broadband. They have two plans one is $39 a month, the other $59 a month. They are a little expensive but available virtually every where we travel. We also use it at home.
One advantage of things you an use on the road and at home is you're not paying for somthing different at home while you're on the road.
We spent a week wayout in the Badlands, down a dirt road on an indian reservation. There was no cell phone signal but there was Verizon Wireless broadband. We have now bought a cellphone that uses the same signal as the Broadband.
If you have a smartphone, like the Blackberry, you can tether (connect) your cellphoine to your computer for an internet signal as well.
Hope this helps a little,
Norm and Ginny Milliard
1982 Sunline 15.5 SB
2004 Honda CRV 4 cyl, manual