Even though mobile Internet is still driven by needs rather than wants, it continues to grow thanks to better technology. According to the latest data from comScore, the number of people using mobile broadband technology to access the Internet grew by 154 percent in Q4 2007 to 2.16 million from 854,000 in 2006.

"Though mobile broadband access is currently used by about 1 percent of the total U.S. Internet population it is poised for significant growth over the next few years. As consumers increasingly demand and depend on portable Internet access, the demand for mobile broadband should continue to increase," said Serge Matta, senior vice president of comScore, in a press release.

However, it appears mobile Internet is somewhat limited to high income households. Users who belong to income bracket of more than $100,000 are 37% more likely to use mobile Internet.