David Pogue posted in his New York Times blog about Internet on the go technology. I was glad to see that review, I recently just came back from a business trip in New York City and realized not every city is completely wired like many of the cafes in Silicon Valley. Buying a wireless internet card is a great option to enable internet access from any location covered within the plan. His recommendation was the Sierra/Sprint Wireless Compass 597.
Some other options are the Verizon Wireless Broadband Access card and the AT&T Laptop Connect. Because I spend most of my time in Silicon Valley, for now I will keep hanging out at the Silicon Valley Wi-Fi friendly cafes and businesses like Crayons and Cubes or Starbucks.