My predictions:
The PS3 will beat 360 in 08
The Wii will continue to sell more than it's competition, but will stop selling out in stores by September Will have sold more than N64 by the end of 08
MGS4 will have a small, but signifigant impact on PS3, but will flop in Japan
Devil May Cry 4 will not be a systemseller
Only the hardcore PS3 fans will care about Little Big Planet
When you add the week one sales of SSBB from all territories the game will have sold 2.5 million(unless there is a shortage)
Mario Kart will be delayed until fall 08
Wii Fit will have moderate sales in America and Europe
The 360 version of GTA4 will outsell the PS3 version 3:1