There's now the original BlackBerry Curve 83xx series, the BlackBerry Curve 8900 and the more newly-released BlackBerry Curve 8520/30 on the market... that's a lot of Curves available for purchase on a lot of carriers in the USA. And according to the IDC Mobile Devices and Technology Trends division that tracks these things the BlackBerry Curve was yet again the best-selling smartphone in the USA for the calendar Q4 part of 2009. The top 10 smartphones sold in America were as follows:

1. RIM - BlackBerry Curve
2. Apple - iPhone 3G S
3. Motorola - DROID
4. Apple - iPhone 3G
5. RIM - BlackBerry Pearl
6. RIM - BlackBerry Bold
7. RIM - BlackBerry Storm
8. Palm - Pre
9. RIM - BlackBerry Tour
10. T-Mobile - myTouch 3G 

Pretty solid results for RIM considering they cover 50% of the top ten. They had this to say on it:

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CrackBerry.com's feed sponsored by ShopCrackBerry.com. Q4 IDC Results Are In: BlackBerry Curve Yet Again Tops List of Best-Selling Smartphones in the USA