Just wondering, using Exchange 2010, has anyone developed or
discovered any kind of interface that would allow users to set up
forwarding by themselves to an external email address?

I know how the Exchange Admin accomplishes it, at least on Exchange
2007, that is, create a mail contact and use the "Delivery Options" in
"Mail Flow Settings" to forward the user's mail to that contact.

But we're thinking of putting our student email on Exchange 2010, and
are pondering allowing them to forward their university mail to google
or whatever.