Cross-Platform Online play?

Meh eas Mavel games are shite
The problem is, on games like competive games some people might have the advantage. But I don't think it's possible for the system needs to know how to read the incoming data its recieving.
Microsoft is doing cross platform, for halo 2 at least. When it comes out on Vista, you can face people on Live. And of course, PC > Consoles because of the mouse accuracy. But in the future if there is pc vs Wii, the Wii has the best chance of at least getting close to beating a PC.