Building or integrating customer support in Drupal

I've had a question for many months, originally starting here: http://drupal.stackexchange.com/questions/3564/which-modules-should-i-us...

The question remains unanswered, although integration of a third-party system currently seems most appealing. Has anyone already done this in Drupal - something customer-friendly? I know there's Open Atrium, but that's in 6, and it's difficult to theme. Whenever I set this up, I want it to be a step forward!

Come and chat with me about this if you share my problem. Loose, conversational format. If you've got an environment set up, we can even install and some stuff and see how it flies.