Just a few things that stand out so far, none of which are what I'd call critical issues:
The icons are average at best - particularly the Home thru Logout ones at the top of the page.
The icons next to each thread aren't easy to distinguish (maybe its just foreign right now).
No option to change post size - I miss 50 per page.
That aside:
"Web 2.0" Blue has been done to death. Is there a better theme around?
20,000 characters is a lot. If you need any more, you should rethink what you're posting (yes bill, this includes you).
Don't move the old posts over - think of this as a clean start with postcounts for those who like to measure their e-ego in that fashion.