A couple changes:

'Contacted' people (on load; not when you just clicked the Contact checkmark)
should look greyed out somehow.

Change the top tab text from "IWH handler" to "Prospective helpers".

If you aren't logged in and a current contributor to this project, the
"Prospective helpers" tab lists a list of helpers without the contact interface
(checkbox, remove link, huge email link). Like the current list of IWHelpers in
the sidebar (which we would remove). At the top, there should be some text
telling people "If you are a contributor to this project, add it to your profile
and you will be able to contact these people from this page" or somesuch.

Now I'll go make some feature request bugs for actually implementing this stuff.