No such thing as 'official' in the way that you mean.
Nintendo has been the uninterrupted leader of portable gaming for ~30 years now (Game & Watch, Game Boy, Game Boy Color, GBA, DS, DSi)
The switch for consoles was in the year ending March 1998 when Sony shipped more consoles (PS1) than Nintendo did (N64 + SNES + NES) for the first time after just missing in the year ending March 1997.
There is a transition back toward Nintendo occuring right now. In the year ending March 2008, Nintendo shipped 18.61m Wiis and something like .1m GCs, while Sony shipped 13.73m PS2s, and 9.24m PS3s.
In the year ending March 2009, Nintendo will ship ~26.5m Wiis and Sony will ship ~8m PS2s and ~10m PS3s.
PS2 demand (in terms of stores buying PS2s) is pretty much over now given that Sony shipped only 20,000 more PS2s worldwide in the quarter ending Dec 2008 (whereas DS, PSP, PS3, Wii, 360 had shipments climb by 50-100%) than in the quarter ending September 2008, so the year ending March 2010 will be solidly in favor of Nintendo, perhaps something like 25-35m Wiis to 4m PS2s and 12.5m PS3s.
People are difficult to govern because they have too much knowledge.
When there are more laws, there are more criminals.
- Lao Tzu
