I watched the JK Rowling episode of Who Do you Think You Are. I love watching this series because unlike most historical documentaries, this series gives a deeper insight into what it would be like to live as the ancestral individuals from an almost first person perspective. I have not missed any episode since it began a few years ago. The ancestral tracing and investigations make for fascinating viewing. Sometimes they discover tragedy, irony, heroism, or shocking revelations of their ancestors. Some of their stories would make great novels. As the celebrities investigate various elements of the ancestor's past, we get inserts of history lessons from the program's narrator giving a global picture of that particular time in history. Its a very well constructed series.
I was waiting for JK Rowiling's episode for a while and I was not dissapointed. Her investigations into her Great Grandfather Louis Velong was riveting and turns out pretty epic. Its on BBC iPlayer now, highly recommended viewing for everyone, not just potter fans (though potter fans will get a tad extra in some of the ironies in Rowling's discoveries ;-) ):
http://www.bbc.co.uk/iplayer/episode/b0 ... K_Rowling/
If you enjoyed that episode, be sure to check out past episodes too. My favourites were Jeremy Paxman, Boris Johnson, Ian Bishop (he was the first), Bill Oddie, David Tenant...actually there are so many favourites, I might as well just stop there.