Last April, Nintendo president, Reggie Fils-Amie, told reporters:

"Apple is not having not having an impact on Nintendo when you look at our business, our volume, our hardware, our software. I’ve seen data that suggestions that while consumers are constantly downloading Apps, they play with them for a few times and then they are moving on to the next thing.

Clearly it doesn’t look like their platform is a viable profit platform for game development because so many of the games are free versus paid downloads." 
However, later that year, in October, he changed his tune a bit and admitted that out of all the companies aiming at Nintendo's throne, the only one its worried about is Apple. 

However, later that year, in October, he changed his tune a bit and admitted that out of all the companies aiming at Nintendo's throne, the only capable of doing any damage is Apple.

He was right. A new report from research firm Flurry Analytics shows that Apple, and the gang of Android-powered devices, are indeed having an impact on Nintendo. 

According to their report, Nintendo's portable gaming market share dropped from 70% in 2009 to 57% in 2010, and the culprit wasn't Sony's PSP. In that same time, devices running iOS and Android together gobbled up 34% of the market

Maybe things will change when Angry Birds becomes available for the DS.

[via CNET