Definitely interesting and worthwhile. The LDAP capability is interesting -- I suspect most other code like this is really specialized towards databases. These are the questions/comments that come to mind:

• How does this compare to other modules of this type? (Quick CPAN search reveals DBIx::Migrate and Class::DBI::DataMigration)
• I agree that "Data::Sync" doesn't seem quite right. First, the name is extremely general, whereas the module is specific to databases and LDAP, not any type of data. Second, it does a one-way merge-update, which is only a narrow, almost colloquial meaning for "sync". For "sync" I'd imagine something that was bi-directional and helped manage conflicts.
• What kind of performance does it have for large datasets?

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