In response to a General Strategies question, @deceze commented that he'd recently won a cultural victory with just 2 cities and no real military vs. his main competitor's 40 cities.
I've always assumed more cities = better empire: if I have 40 cities I should be able to squash an opponent with 20, whether I focus on military, culture, or science. Is that wrong? I love the idea of micro-managing a tiny empire rather than wearily juggling lots of cities and units toward end-game. (This partly comes from my earlier question about avoiding a tedious end-game: a small empire is inherently less tedious.)
Is "Micro-Empire" a viable strategy for one or all of the victory conditions? If so, how do you pull it off?