9/14 are firsty party.  ~64%.

Of course, two of those third party games I regret buying (Madworld and No More Heroes), something I can't say about my first party collection.  And of all future titles announced for Wii, the only ones I'm interested in are from Nintendo.

So 75% of the Wii games I own that I actually like are firsty party, and that number will only be going up.

I have 28 ps3 titles, and 17 of those titles are first party.  ~61%.  That's just retail.

Though I'm probably an anomoly there.  SCEWWS is the only house of developers that comes close to Nintendo, imo, and a majority of my entire collection has been published by one of those two.  Especially this generation.

I own 78 Wii games on retail and 64 of them are third party games.  So that makes for approximately 82% for me.

Mario Party 8 
Mario Galaxy 1 & 2
New Super Mario Bros.
Metroid Prime Trilogy
Metroid Other M
Wii Sports
Wii Sports Resort
Wii Fit and Plus
Wii Play
Wii Music
Zelda Twilight Princess
Super Smash Bros
Mario Kart
Punchout

Zack and Wiki
Resident Evil 4
Mursama
Okami
No More Heroes 1 and 2
De Blob 
Mad World
Tatsunko Vs Capcom
Sin and Punishment 
Monster Hunter Tri
The Conduit
Rayman's Raving Rabbits

Nintendo 16 
3rd Party 13

Pretty balanced not including Wiiware or VC downloads

Certainly less than PS3 3rd party
Mostly Ubisoft and Capcom
Red Steel 2