I have the same problem with 3.2.1.
the "DisableFirstStartWzd_ooo32.oxt" mostly works, it actualy does disable most of the first start wizard and the the participate in the improvement popup question. But a small register now/later/never/already windows still popsup for each user. I cant seem to find a way around it either... This is for a school and they are going to hate us when a student has to click past it on every different computer they log into.
OpenOffice 3.1 on Windows Vista