http://news.cnet.com/8301-1035_3-10232698-94.html?tag=newsEditorsPicksArea.0 Research In Motion's BlackBerry Curve overtook Apple's iPhone to become the top-selling consumer smartphone in the United States during the first quarter of 2009, according to research published by NPD Group on Monday. NPD's monthly "Smartphone Market Update" report, based on online surveys of consumers, now ranks the best-selling consumer smartphones in the U.S. as follows: 1. RIM BlackBerry Curve (all 83XX models) 2. Apple iPhone 3G (all models) 3. RIM BlackBerry Storm 4. RIM BlackBerry Pearl (all models, except flip) 5. T-Mobile G1 NPD attributed the recent BlackBerry sales surge to an aggressive "buy one, get one free" promotion for the phone by carrier Verizon Wireless. It helped boost RIM's share of the consumer smartphone market 15 percent to capture nearly 50 percent of the market in the first quarter, NPD said in a statement.