There's lots of places perl can still be useful to you. In log-munging, and CGI apps (though you've mostly moved to ASP, CGI can be nice for rapid-prototyping, and for building static pages with), but other people have already pointed them out to you. However, it's quite possible to call perl code from Microsoft languages, or any other language where it's possible to use COM Automation, with the Microsoft Scriptlet Control library -- just create a perl object, execute a file-do, or a use, and then execute your functions. Once people see how much easier it is to code things in perl, esp making hard things possible, they're start to code in it more and more, I suspect.

(You're need an activestate perl install, and the microsoft scripting runtime, which is standard with IE5+.)