I'm not sure if the idea is future games or current ones (or both) so I'll just go with future games:
Wii- Way too many to choose from so rather than name an obvious big one like Mario or Metroid I'll go with the more obscure but amazingly intriguing Treasure Island Z.
DS- There's a lot but most have recently been released (and are as yet unpurchased) so I'll go with a hoped for game, sorry if I'm taking too much liberty here, and say Animal Crossing:WW 2. The one that links to Wii version of Animal Crossing.
PSP- Well there aren't any that I knew of prior to this thread but I am a good forum member so I looked over the game list for the PSP and will choose Castlevania X. It sounds pretty cool especially if they can continue their GBA/DS string of success on the PSP.
PS3- Resident Evil 5.
360- Halo 3.
Sorry I had to just go with big obvious games on the last two but I'm not terribly interested in either at the moment.
