Since my previous two questions on Premillennialism were nicely answered, it's time for the next one:
Postmillennialism is a view of the end times that basically says that things will get better and better, more and more (to eventually almost if not all) are converted, and the church expands. This period (which we are in now) is the millennium, and after it is over (i.e, after the world is almost completely awesomeified), Christ will return. (postmils: correct me if I err in my description).
What is the biblical basis for this belief? Also, what logical deductions that support this belief can you make from biblical passages?
It seems the strongest arguments are in favor of Premillennialism, as there are several passages about the tribulations that will happen to Christians, and I'm not aware of any "Fear not, the world's gonna get awesome!" verses, so what's the reasoning behind Postmillennialism?
If tradition can be a convincing argument, feel free to use it.