I saw it but am unsure if Dent survived the fall in the film's final moments. Can someone help?
It's left pretty "clear" from the movie's point of view that Harvey had died but we're not told, conifrmatively either way.
It's entirely possible the Mayor and Gordon set up the public vigil to continue a ruse that Dent had died and they really have Two-Faced locked up in Arkham or some other secret location.
I loved the moments with Joker hanging upside down monologuing to Bats, it was a great speech especially with "I think we're destined to do this for a long time." Another great moment.