I tried to contact the CDB_File author last week. There's a bug in the module which I'd like addressed. The C code is not C99 compliant, which means it won't compile on some machines.
His name is Matt Sergeant (MSERGEANT). I've attempted to contact him via his cpan address, as well as his http://sergeant.org/ address. No love so far. There's a co-maint on this module, but his emails are bouncing. If anyone knows how to contact Matt, I'd like to help fix some of the bugs in this module, Many of the patches are already in RT but unresolved for the past 3 years.