Only really found out about it with the 2005 revival but with all the publicity surrounding it's return, and comments from older people around me, I understood it was an old show brought back, which kind of made me think it was going to be a short lived gimmick, especially casting billie piper which seemed like casting for the sake of publicity. How wrong I was, and glad to be so.
Couldn't actually watch when series 1 broadcast as I worked Saturday evenings with no option to record, but as I heard more about what it was about I was so fascinated by the premise and this character of the doctor, and some odd clips of repeats I managed to see. Come Christmas I'd heard enough hype to know that he had regenerated and exactly what that meant, and my family had been watching the series because my parents remembered it from there childhood, so christmas day I watched the Christmas invasion with my family and that was it, I was sold. Remember buying the series 1 dvds and racing through them before series 2 and have been a big fan ever since. Even though I remember all that it now seems weird to remember that it's only been 9 years, as it's now so embedded in the mainstream that it seems crazy that 10 years ago, for most, it was either unheard of, or a tv relic from a bygone age.