Nine hundred years in time and space, and I've never been slapped by someone's mother.
I like how introspective and deliberate Doctor Who has gotten, and how it explores questions that nobody bothered to ask in the older series. Some of these are obvious ones, such as when people ask "how do you mean... `companion'?" and others are more subtle, such as nondeterminism and how the TARDIS moves through different timelines. I'm actually still not clear on the latter; for example, what would have happened in "Aliens of London" if the Ninth Doctor and Rose had just gotten back in the TARDIS and tried to go back a year after he realized his error.
Another question that always plagued me: does a TARDIS have a means of visualizing the destination? How does a Time Lord manage to put down where people aren't looking, even in a heavily populated zone? (This is especially puzzling given the apparent condition of the Doctor's TARDIS and his inaccuracies in time travel.)
Icon update
Restored:
cute, by
banazir for 
teunc (Sox from Kittenwar.com)Updated:
music, author unknown (Calvin and Hobbes by Bill Watterson)
fandom, by
lucius_admirer in dwicons (David Tennent as the Tenth Doctor with Billie Piper as Rose)desire, by
lucius_admirer in dwicons (Rose and the Tenth Doctor from Doctor Who)New:
congratulations, by
fan_this in atlantis_icons (David Hewlett as Dr. Rodney McKay on Stargate: Atlantis)planet, by
the_10thdoctor in dwicons (Rose and the Ninth Doctor from Doctor Who, attending the death of Earth)farewell, by
watchpoint in dwicons (Rose and the Ninth Doctor from Doctor Who, attending the death of Earth)politics, by
cho_chan (James Callis as Dr. Gaius Baltar on Battlestar Galactica 2004)--
Banazir
