The 3DS has sold 4.5 million units, compared to the original DS's 2.3 million.
With a library of over 100 physical titles, the 3DS has sold 9 million games; the DS sold 5 million with 58 titles.
The eShop, which wasn't available in the DS's first year, has over 500 games available. Nintendo wouldn't provide sales statistics, but did mention that on average a consumer downloads five games or programs.
In terms of general revenue, including software and accessories, the 3DS has generated $1.2 billion; the DS managed $540 million in its first year.