I like eclipse. Yes, I know, it's a java IDE, but it does what it needs to quite well. You have package name completion and other helpful little things. It helps refactor your code and what not.

Hey, you said IDE"s, not which ones.

As for perl, I like perl -d. If you are comfy with gdb, -d will work quite well. It brings in a perl lib for debugging, I can't remember the name atm. (Free XP for the guy who first mentions it ;) ).

If you want graphical, try ddd. It's nifty to say the least. ddd