The show is still very-very successful, so it has a few more seasons in it.
Gregory House is the main character
No, House MD continues its run with a 6th season set to begin in September 2009.
House has a double specialty in infectious disease and nephrology.
It ended.
Only on the show
Princeton Plainsboro Teaching Hospital
No. They are currently showing season six.
Neither, they are both copying old MD shows like ER.
No, House MD is not over. I have heard that season 6 will air in November, but this is just speculation. House has been bringing Fox great ratings, so it is highly unlikely that the show will not be airing again.
The end song was written for the show, it is not a purchasable song.
He was doing work to assist the presidential election
The show has been cancelled and already had the series finale