iPad 3G owners come this Friday. As we've already known, you'll be paying $14.99 for 250MB or $29.99 for unlimited (yes, truly unlimited with no 5GB cap) data in addition to free access to AT&T's comprehensive collection of WiFi hotspots -- perhaps the more interesting bits, though, have to do with plan management on the 250MB setup. Basically, you'll get a warning on your iPad when you get to 20 percent of your allowance remaining, then again at 10 percent, and finally when you run out; at each message, you'll have the chance to re-up (of course, if you find yourself blowing through 250MB on a regular basis, you probably want the unlimited plan anyhow). Plans renew automatically after every 30 days, and you can check your usage at your leisure from Settings on the device. Sure, you might be cursing the fact that you've found a legitimate reason to spend another $30 every month -- but at least you'll be able to set it up and manage it without a call to customer service.