Thanks Robert.
I tried deleting the revisions first but that gave me more referential integrity errors...
But anyway I was able to delete in the end. Just wanted to be sure my nulling out latest revisions idea wasn't gonna bite me back one day;)
I'm on 4.6.1 and postgesql 7.2.4.
I'm loathe to upgrade to 4.6.3 cuz I had such a hard time getting my first install of OACS to work with all the packages I wanted... but I will one day;)