I second this, it would be very handy and it can be inferred from the URL. Perhaps put it after the username box as static text so users know what it will do.
-Norman
I posted this a while back on the users list and don't recall whether it was possible or not.
I simply want the text box portion of the username field to be pre-populated with my domain name (@domainxyz.com) so my users just have to type in their username.
Is this possible?