I am well chuffed with my work ouput for the day, had an arse of a job to complete, including using loads of regular expressions, and it is all up and running.
Damian Conway's Data Munging course handouts proved invaluable, I really like his take on regexps with his railway diagrams.
I have used his Data Munging handout more than any other Perl reference material (including the O'Reilly books) that I own. He is a very talented teacher, his writing style is concise, useful and not condescending. The handouts are full of useful bits and bobs, a bit like the Perl Cookbook.
I think that must be the hardest part of teaching anyone, getting the balance between showing off your impressive knowledge to the gurus in the class, and actually giving the people who see Perl as another tool in their job something practical and useful to take away from the class.