Two of the versions are on sale till the end of the week: The most basic version, DataMan Next, is free (from a buck); and DataMan Pro is on sale at $5, which is half off its regular $10 price. The Pro version also now reports hourly data usage by app, which pretty much makes it the most detailed data-tracking app out there.
Having the ability to connect to the ‘net over a cellular network from almost anywhere is a huge asset, and one of the best things abput the iPad (if you have the 3G/4G version — which you should). But there’s nothing like the shock of suddenly discovering a $300 bill for data overage to make one extremely skittish about ever using data again — which completely ruins the whole point of getting a 4G iPad in the first place (unless, of course, you just bought it for the GPS receiver).
To banish this evil conundrum, you’ll need DataMan Pro for iPad ($4), an app that watches your data usage like a hawk and alerts you when you’re gobbling data too quickly. It’ll even tell you which apps are the most data hungry.