It can't have escaped your notice that the Playstation Portable has launched in the USA last night. And while it's not Symbian based, expanding the market for mobile devices is going to benefit everyone - what it's going to do to the N-Gage Ecosystem is going to be very interesting. In a special three-part series, Chris Rydberg looks back at the history of mobile gaming, the current 'race' and what the future could hold. Part one, The Casualties of Christmas Past, takes a look back to see where previous handhelds went wrong and what lessons can be learned.