Sorry in Japanese.
Nintendo announced a OneSeg Tunner adaptor for the DS on 15th evening. With this adaptor, users can watch OneSegment TVs.
Nintendo's CEO Iwata, has said, "Making it (DS) supporting OneSeg, the DS will be able to be as a portable TV."
OneSeg is a Digital Broadcasting stream for Laptops and Cellular Phones, so if your in a Signal supported area, you can enjoy clear TV broadcastings.
And since this is Digital Broadcasting, if you can receive the signals, it will be clear, and also show subtitles as well.
Currently OneSeg is on test, but it is said that the service will start on April 1st. (Gieese: JPN schedule)
This will work on both DS and DS-Lite. Target Launch within this year.
PSP is using Internet and can watch the TV using "LocationFreeTV".
Well anyways, sorry if this was posted before.