I had to do a mass update of dns records in our bind (on debian lenny).
I have no room for error and in my experience i know that bind is very sensitive syntax.
I specify you : i have no backup of the server, nsupdate is not installed on it and i'm not linux guru.
There is way (script) to do update from csv file like this:
RecordName, old IP, New IP, Type, DbZoneFile,action
Did you have a litle script to do this?