Notify all taxa

This module only considers the first term of a node when sending notifications. Instead, It should iterate over all terms, and send notifications as needed. Take care though not to email same user twice. How about

foreach ($node->taxonomy as $tid)

Also, one could argue that we should not email when updating a node. This might save some useless notifications when an admin is just reclassifying a node quietly. I personally prefer undernotifying to overnotifying.

-moshe