There's no denying the quality of the PS3 games lineup, unless your a fanboy. The Wii isn't lacking good games either however. Just because Nintendo has yet to announce games, doesn't mean the Wii has nothing.
What we know about so far (and some already released games): Madworld, HOTD:Overkill, LKS, The Conduit, Muramasa, Arc Rise Fantasia, Phantom Brave, Klonoa, The Munchables, Boom Blox Bash Party, Dead Space Extraction, Overlord Dark Legend, Red Steel 2, Wii Sports Resort, Punch-Out, M&S Olympic Games, Deadly Creatures, Sonic and the Black Knight, Rune Factory Frontier, Valhalla Knights: Eldar Saga, Rabbids Go Home, No More Heroes 2, Sin and Punishment 2, Spore Hero, as well as the remakes (NPC! and Resident Evil), Sports Games, and multiplats.
As it stands right now, for 2009 PS3=Wii>360, but this will most certainly change after E3.