Economic downturn and Sprint woes be damned, because AT&T's not hearin' a bit of it. The company's wireless unit -- which also happens to be the largest carrier in the country -- announced that it put up some serious numbers in the first quarter of 2008, growing revenue 18.3 percent year over year for a grand total of $11.8 billion. It tacked on 1.3 million new subscribers in the quarter, an 8.7 percent improvement in net gain over the same period in 2007, and grew ARPU by 2 percent in that time. Perhaps most eye-widening, though, is the fact that wireless data revenue grew a boggling 57.3 percent over the last year, thanks in part to the 620 million and 44 billion multimedia and text messages sent in the three-month span, respectively. Needless to say, the wireless division's looking just a little more... shall we say, "dynamic" than the wireline group at the moment, as recent job moves would indicate.