Series 1, week 1.
I started watching it with little interest in dancing. I'd watched because I had a massive crush on Christopher Parker at the time. At first, I was a bit lost, because I had no dance knowledge at all and knew very little of the celebs. Slowly, though, I grew to love series 1. I loved how different the show was to the usualy reality TV these days.
I know I watched series 2 and 3, but of all the series, they're the 2 I remember least, strangely. It's shocking. Of course, I remember them, but not as well as I remember the others.
I can remember most of series 4-7 though. :P
The standard of dancing has improved, but I have to agree with La Triviata. The innocence of the show seems lost. Way back then, it was more about something entertaining to watch and people didn't seem quite as bothered about Chris Parker making it to the final as they did about JS last series or Craig this series. It seems to have made a lot of people love dancing more, which I think is why it bothers them when no-hopers stay in so long.
I'd love to think new people fall in love with it every series. I just hope we manage another series or 2, at least, out of it.