Since you use Windows, you should check out Visual Perl or Komodo from ActiveState.

Visual Perl is a plug-in for Visual Studio, which Microsoft would very much like you to use. Komodo is a full cross-platform IDE which comes with a nice endorsement from Clay Shirky. (If it's good enough for Shirky, it's more than good enough for me.)

I don't work with Windows, so I can't personally recommend either. However I've used ActiveState products in the past, and I've got to give them credit for putting out first-rate code. They really seem to know what they're doing.

And while Komodo and Active Perl aren't open source or free as in beer, I am more than happy to support businesses that base their revenue model on open source products, particularly when they're responsible members of the community.

Finally, one application that always seems to get lost in discussions of IDEs is Emacs. It seems that it would meet just about any definition of IDE (or the definition of just about anything else including the kitchen sink for that matter ;-).

I know this isn't exactly what you were looking for in your post, but I thought I'd throw it out there for any other monks who may be interested in related products ....