The answers are here at last - the champion has been decided!
Face buttons: 8 (A, B, X, Y, Start, Select, Home, Power)
D-pad: (Yes)
Dual analogue sticks: (Yes)
Rumble: (Yes)
Screen: (Yes)
Camera: (Yes)
Speaker: (Yes)
Triggers: 4 (L, R, ZL, ZR)
I.R: (No)
Microphone: (Yes)
Rechargeable battery: (Yes)
Motion sensors: (Yes)
My idea: Sensor Strip, interacts with Wii Remote
My idea: Stylus & holder
My idea: Infra Red Receiver (unknown use, possible data transfer)
My idea: Headphone Jack
My idea: Connector Port (unknown use, however not for Wii accessories)
I guess that's 17 possible points!
Unknown as of June 2011:
*No I.R (i.e for a pointer) but an I.R receiver like the 3DS.
*Internal memory is a possibility, as the Wii had a tiny amount for Mii storage.
*The controller may or may not have a dock or charge stand.


Results:
The Unagi = 0 ;-P
Crimm = 1
RABicle = 5
Taffypool = 6
Bman87301 = 6
Shaymin = 6
Mop it up = 7
UltraClayton = 7 points
Killer_Man_Jaro = 8
jrlibrarian = 8
TheFleece = 9
UncleBob = 9
BlkPaladin = 10
BlackNMild2k1 = 11
Ceric = 11
Tied!
Send me an email (accessible form the staff page) with your addresses and I'll send you a little something from Japan :-)