The one thing that I think any portal system needs to have 'built into it'
is ATLEAST a 'Feedback form'
Like Contact us with a form...
Also I think it would be really good to have a 'Refer a Friend' option incorportaed into TP itself.
They would make good additions to the next tp --> built in contact form and refer a friend form (with scripts ofcourse)
Just a suggestion - hope it proves useful