According to data from the NPD Group’s latest Smartphone Market Update report, the BlackBerry Curve unseated the iPhone 3G as the top-selling smartphone in the U.S. in Q1 2009. The iPhone 3G came in second, followed by the BlackBerry Storm, BlackBerry Pearl, and the T-Mobile G1. NPD attributes the jump in BlackBerry sales to Verizon Wireless’ “buy-one-get-one” promotion. BlackBerry maker RIM’s consumer smartphone market share…