Friend codes are fine, they just need to be able to extend across all games. That would be ideal.
Unified Nintendo Points would be pretty nice, though tying in a DSi with your Wii has the potential for some serious abuse. You could potentially steal someone else's points right out from under them, and I don't think Nintendo will run that risk.
Aside from that... I like the Wii's online experience. It's very clean, it's very simple, and it's very easy to navigate.







