Other than DSi ware, is there really a need to buy a DSi?

[coasterlove]

If I didn't already have a DS, I would probably get it. So the reasons that I would get it would be for the DS Ware or whaever, the cameras and that functionality and also the internet depending on what it can do.

I haven't followed the DSi much so I don't know a whole lot about it, including the internet features. Can you watch videos on it like Youtube as you can with the Wii? Can you only go on the net where there is WiFi? It's a lot of stuff like that I would need to know beforehand.