Im going to put my two bobs worth in on the Aussie ones. I think the best ones were Jack Thompson, and Cathy Freeman as they did seem very interested in their ancestry whether their ancestors were a highwayman like Jack's or cathy's ancestors being treated horrifically
I personally am turned off with the ones who get disappointed when they find their ancestors were not rich and had plenty of money as a few have done and hence lose their interest in doing it. You can plainly see on their faces and their whole attitude changes when they find no hidden 'riches' are in their lines.
Thats so sad as I am proud as punch for my normal labourers and so forth and you would like to think that celebs would also be that way but it is shown some are not

Thats my two bobs worth anyways.
Shanko