You don't say why you've chosen CGI instead of ASP (I assume you mean ASP when you mention IIS).

If you've chosen CGI just because it supports Perl, you should be aware that Perl can also be used to write ASP pages - when I developed an IIS site I used PerlScript and ASP and found this combination better than VBScript or plain CGI, although I prefer mod_perl better still!

You may already know this, but there are Perl and ASP programmers out there who don't, so this might be useful.