You might want to take a look at Network Programming with Perl by Lincoln Stein. I've skimmed it a few times and it seemed great -- it's got quite a bit of sample code and provides multiple ways of doing the same thing so you can really see what's going on. And IMO Lincoln writes and organizes quite clearly. I wish it covered POE, but we can't have everything, right?

Chris
M-x auto-bs-mode