I'm currently using a Mio 550 PDA for some of the functions you mention. It runs sat nav on the bike (in a protective box) plays mp3's and movies and does wireless internet connection / e mail.
It will also do (simple) games and runs a cut down version of word via an on screen keyboard that you poke with a stylus.
The downsides are it most definately needs protection from the elements / vibration if you are using it handlebar mounted, a 7cm x 5.5cm screen makes web surfing a scrolling chore and the storage comes from (up to) 2GB sd cards so photo storage is not really a runner.
The 15" laptop I'm writing this on does all of what you want (except sat nav on the bike!) but is much larger and even more fragile. Not a problem in a car but I would have thought the odds were against it surviving 12 months on a bike (although no doubt someone will have done it.)
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