I am so behind the times... I think the last series I saw was VII. I sort of watched VIII, but a lot of real-life distractions kept me from really being able to follow it (and I was still grouchy about the casting change for Kochanski), and didn't see IX/Back to Earth at all. *sigh* Time, I think to find the best home-video transfer and revisit the whole thing (my I-VI VHS tapes have long since died, and I heard questionable things about the DVD transfers).
--Jonah