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On a recent trip I signed up for a month of T-Mobile's unlimited access. It's pretty convenient because of the thousands of T-Mobile Hotspots at large hotel chains, major airports, Barnes & Noble Bookstores and Starbuck's coffee shops.
Any competent IT department who allows their employees to use one of these services uses VPN software, which can increase the complexity for the end-users.
I think in the near to long term, Wi-Fi and similar technologies like WiMax, are the way to go for wireless broadband access. 3G & 4G wireless networks are coming, but I think a combination of the two using "hybrid" networks that seamlessly switch back and forth will become popular due to the strengths and weaknesses of each network (geographical coverage, RF limitations, etc).
The costs of these services are likely to decline over time. The early adopters are footing the bill for the infrastructure investments and paying a premium before economies of scale bring down the prices.
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