eyeball226: The Wii and 3DS DO use a centralised account, there's only one friend code for the whole console. Once again people are displaying a high level of ignorance for the thing they're criticising.
The Wii does have a centralized account but to play with/against friends you need the game specific codes which are different in each game. These game specific friendcode on the Wii is not _needed_ to play online or anything, but needed for friend invistes, cooperative play etc _within_ most games. Not for Wii online functionality.
The centralized account is just for sending messages and some game features, but in general not for online gaming as _most_ games use specific friendcodes.
You can verify that by looking at your friendcode in game X (Super Smash Brothers Brawl for example) and then put your friends version of the game in your Wii and voila: your game specific friendcode changed as it is generated unique out of hardware and software specific IDs
The 3DS changed that and only has one code for everything.
Nevertheless: I'm totally waiting to buy a Wii HD as the Wii was kind of a letdown with big game releases. I just hope all those rumors are true :) Then it's most likely a Day-1 purchase :)