Have you advanced past only using scalars and arrays and tried hashes? Have you learned what a reference is, how to create and dereference one? Have you started creating advanced data structures (AoA, AoH, HoA, HoH, etc)? Have you created a module? Used OO? Used AUTOLOAD? Mucked with the symbol table? Discovered B::? Actually used it for something useful? Delved into the perlguts? There are many different ways to measure your growth as a Perl programmer.