What happened to array-shift.com (Drupal Stackoverflow Clone) It's interesting that there is no (recent) Drupal implementation of SO-like features.  I (and others) have a need to have an SO clone that has areas for private data (corporate owned), so we cannot use SO or the StackExchange engine.  I had high hopes for http://drupal.org/project/arrayshift, but it's fallen into disuse (and the demo site has been down for months).

Any suggested alternatives?  We've looked at OSQA and Question2Answer, and both seem like an annoying integration mess for user profile information.
What "happened" is what commonly happens to an idea that is generally solid but not (yet) popular: it's not being used and therefore not being actively maintained.

The best way to combat "disuse" is to use it. Create your own sandbox copy and start improving it. Ask Eaton for permission to take over the module and he'll give it to you.