RJA #3A: Exploring Research Topic

On Google Scholar I found a book about Melungeons titled "Melungeons: Resurrection of a proud people...," and another titled "Melungeons: the last lost tribe in America," and several articles located on JSTOR.
Technorati, Debatepedia, or Squidoo returned zero results for the word 'Melungeon,' so maybe when some more of my work is gathered and cited I will be able to add to these sites.
Wikis were somewhat helpful, always a great summarization but never to be taken on face value.
Other sites returned a few various blogs, however none seemed to be very continuous in the coverage of Melungeons, and it was only mentioned in passing. Most of the relevant and scholarly sites were bookmarked using Delicious.
There seems to be sufficient information available to cover the many questions I have about the Melungeons, such as the following;
Who are they now?
What genome and phenotype do they have?
When did they become a tri-racial group, and approximately how long did that take?
Where are they from?
Why do they belong to a separate group or race rather than just one, two, or none?
Could it be possible that more of the rest of the American population is Melungeon but doesn't realize it?
And the burning question I have yet to answer... SHOULD they be classified separately?