I’m looking at netbooks for a couple of different uses and ran across Dell’s AT&T promotion . Basically, they are suggesting that you would spend approximately $60 per month for always available 3G broadband. One could compare this to a the “tethered” blackberry option from Verizon – we’ve already got unlimited data. Using the BB as a USB modem only ads $15 per month, IIRC.
The most useful thing on the Dell page is a link to a nice CMP publication on the pros and cons of business 3G:
It offers a fairly balanced view of costs/benefits of deploying built-in 3G to notebook users.