Nice-looking update! I'm getting around the new digs OK.
Links to threads on the old site are broken (no surprise there), but I can't find them with search, either. I don't know if I'm doing something wrong with the new search form, or if legacy threads just aren't indexed yet.
On a related note, when I go to someone's profile and try to look at a list of threads they've started, it doesn't show any legacy threads there, either.
I assume this stuff will get hammered out in time, but mentioned them since you asked.