Of course, there's been a lot of chatter in the blogosphere about Chicago losing population- but what you won't read as much about is where Chicago gained and lost population.
Charts are at
If you don't feel like clicking the link, here's the summary:
Downtown Chicago gained lots of population.
Neighborhoods far from downtown lost population.
Again, the evidence suggests: even in population-losing cities, people want more urban living, the more urban the better.