Users of CDB_File might be interested in this patch which fixes some problems with it's handling of GV's which may cause segfaults in persistent environments or just plain strange errors (for me it sporadically triggers "bizarre copy of ARRAY in aassign", under perl 5.6.1 which is pretty unusual).
I've mailed the patch to the author but not heard anything yet, so it's there if it's useful to anyone else.
Oh, and it should also be slightly faster.
Update: The patch has been updated - I forgot to dup the filehandle in ->handle()
