I've published two chapters of the Migration Guide for OOoV2:
Customizing OOo, http://oooauthors.org/groups/authors/userguide2/migration/draft_pub/CustomizingOOo2.sxw/file_view
and General Differences in Use, http://oooauthors.org/groups/authors/userguide2/migration/draft_pub/UseDifferences2.sxw/file_view
Jean
