How would I go about storing the email address of an open chat contact in a variable?

You'd need to use ChatWnd.Contacts.
See: http://m00.cx/mpl/docs/index.html?page=ref-chatwnd-contacts.htm
and
http://m00.cx/mpl/docs/index.html?page=ref-contacts-iterator.htm

But replace  "Messenger.MyContacts" with "ChatWnd.Contacts"

Thanks dude!...

I might actually get around to reading the Docs sometime

Try this, it's what I use.

code:

---

var ChatWndContacts = ChatWnd.Contacts;
  if(ChatWndContacts.Count == 1)
  {
    var e = new Enumerator(ChatWndContacts);
    var Contact = e.item();
   
    Contact.Email

<-----------------{other commands go here}------------->

}

---