One thing that hasn't been mentioned is to hang around here on Perl Monks and answer some SOPW questions.

Don't try and answer everything - try and pick those questions that you're pretty sure you know the answer to - but will strecth you just a little bit.

Don't be afraid to post your answers, and don't be afraid to be wrong about an answer.

You WILL get egg on your face a few times, but as long as you're prepared to be humble, and admit and acknowledge your mistakes - and learn from them - you will learn heaps.

And at the same time you'll be contributing to a great online community.

Cheers,
Darren :)