You might want to have a look at Effective Perl Programming (Joseph N. Hall and Randal L. Schwartz) for material to supplement Learning Perl. In a nutshell, the book helps students develop Perl fluency by discribing idiomatic Perl usage, problem solving, and outlining quite a few gotchas.
Alternatively, even though I would be interested in seeing the reply, you could /msg merlyn or email him at email@example.com. He might not see this node otherwise. (I'm only half kidding.)
Update: I'm currently busy eating the works I struck out above. I can't believe it took me over 16 minutes to write my post.