There's really nothing I can say that the article doesn't.
Nintendo announced the introduction of WiiWare, a game-creation service that will allow developers large and small to create new downloadable video game content for sale by Nintendo through the Wii Shop Channel of the hot Wii home video game system. WiiWare paves the way for smaller, more creative games to make their way to the public at lower prices, without any inventory risk to developers. The first WiiWare content will launch in early 2008.
Nintendo's answer to XNA? It looks like they're even going to let Torque get their hands on it. I don't think this is quite a "web 2.0" level of user content - it's still difficult to make a good game, even with Torque doing the heavy lifting. This isn't going to be a revolution that allows your average computer geek to produce a triple A title. However, I think what this really means is that small and startup developers who are serious about producing games will be able to create smaller games with much smaller budgets.
So that's Microsoft and Nintendo. I personally thought that Sony would have been the first on the User Content Bandwagon.