The newest DS, the XL has a standard SD card slot, for playing music from. Why you would want to do that I am not sure, as there are cheaper and superior players around but it can be done.
This Jerkface Playhouse guy is just windows noob upset that the world he knows a tiny bit of is collapsing around him. People like that react with fear and hostility to anything new.
I have no idea if ChromeOS will be anything more then a thought experiment, but stranger things have happened. Right now Android is outselling the iPhone. Who would have thought eh? granted there are more android phones and they are cheaper but still. And who would have thought that with all this MS is behind EVERYONE on mobile phones. So much for 3rd time is the charm with a MS product. What release is Windows Mobile 7 by now (and no, it ain't 7)
I think Google is just seeing what sticks. It wants to break open the entire IT market and it is succeeding so far. MS ain't its enemy, MS lock-in is its enemy. Same as telecom lock-in and email provider lock-in. MS is breaking this up. more and more small companies and bigger ones use gmail. Gmail. Not exchange. BANG. Gone MS lock-in. For that matter lock-in with anyone. Granted now you got a bit of gmail lock-in although since there is far less tie in going on, you can far more easily migrate away from gmail then exchange.
If the internet becomes open then Google can sells its services to anyone. The more cheap devices are out there connecting, the more people will want to use online services (I barely ever write documents, and then often on different machines, I don't need office. I don't want office. I do use google docs. Anywhere, anytime.) and google makes money from that.
ChromeOS is just another attempt to break the lock-in. Maybe someone will make a cheap netbook with it purely for web access in the house. A cheap iPad for in the kitchen. Or maybe it will be in eternal beta. But Google is constantly trying and a lot of its succeeding.
When news broke about Android outselling the iPhone, where were all the doubters? To busy eating crow to admit they were wrong?
I am personally very intrested to see where Google is going. They are one of the freshest daring companies out there.