iit looks like Wii has good third party support already. Check out Ign's game profile section, it pretty much covers all confirmed games, and all rumored games. There are alot of them actually.
i counted 47, which is great
heres my good game count
Konami 2 (Kojima Game, and Elebits)
Square 2 (Final Fantasy CC, speculated FF11)
Capcom 3 (Suda Game, Inafune Game, Mikami Game(hasn't been announced but its coming))
Nintendo 4 (Smash Bros, Metroid, Mario, Zelda will come out, but probably wont be shown, were not talking the new IPs though)
Ubisoft 3 (Red Steel looks good, not to mention i love Pop, and Splinter Cell is pretty cool)
thats 14, if all goes well, wii'll have at least 8 of those at launch, and the rest of the 6 will come out as time goes by.