I think I can clear up some of these "Doctor Who" questions.
The original series started in 1963 and ran until until it's final episode in 1989.
In 1996 there was a TV-movie that was a continuation of the original series, but it didn't do well so plans for doing the series again were shelved.
However in 2005 The world got a new series of "Doctor Who" which continued on the story. This series still goes on now - in fact new episodes begin airing on Saturday.
Now let's fill in some gaps!
During the break after the original series went off the air and the TV-movie was aired there were books to fill the void featuring the Doctor at that time (7th Doctor - Sylvester McCoy). In the movie some time had passed and the Doctor had been travelling alone for a while, but roughly 30 minutes in we see the regeneration scene into the 8th Doctor (Paul McGann).
Since it didn't take off as a series there were books made featuring him as the Doctor, but when the series returned in 2005 they had decided not to do a regeneration scene with Paul McGann because it was felt that new viewers would have trouble understanding what was happening (since so much was happening here) so they left little hints that he might have recently regenerated in the story and continued the story on from there.
Now with the new series there was talk of a "Time-war" with the daleks that had led to his regeneration, but we've never seen it in books or TV so that will probably remain as an "unseen story". But regardless the series continued on and now we are about to return to the season with a new companion. with the current Doctor (Matt Smith - the 11th Doctor).
So now the rundown is like this:
1st Doctor - William Hartnell
2nd Doctor - Patrick Troughton
3rd Doctor - Jon Pertwee
4th Doctor - Tom Baker
5th Doctor - Peter Davison
6th Doctor - Colin Baker
7th Doctor - Sylvester McCoy
8th Doctor - Paul McGann
9th Doctor - Christopher Eccleston
10th Doctor - David Tennant
11th Doctor - Matt Smith
.. and in closing the and answer to your question, David, it not new versions of the original but a continuing of the series.
Hope that clears up many of your questions.