The Science of Doctor Who on iTunes
If you are like me and do not receive BBC America, you may be pleased to know that their latest Doctor Who related special, The Science of Doctor Who (science in Doctor Who? Who knew?) is available via iTunes for purchase ($2.99).
I haven't seen it yet myself, so I can't comment on the special, though I have heard that not surprisingly it only focuses on post-2005 Doctor Who unfortunately. If you want to find it on iTunes, there's an affiliate link below to it.