That's a good question: So, will it?
During a Q&A session during a recent investors meeting, Nintendo president Satoru Iwata was asked whether or not Nintendo will be releasing its games on hardware produced by other companies?
"Nintendo's software and hardware are the same thing," he replied. "Other companies don't share Nintendo's values or traditions when it comes to creating devices. We are absolutely not thinking of doing that."
So no Super Mario iPhone or Star Fox iPad games.
Nintendo did allow Nintendo characters to appear on the CD-i, a Philips produced console. The games, which were not developed by Nintendo, were horrible - but have since developed a following for being so rotten.