Change Taxonomy Page to display first node in full
The way to do this is to enable the "Taxonomy term" view in Views:

Add and offset of 1 to the page view:


And then add and Attachment display that has a pager with an Offset of 0 and an Items per page as 1. On the attachment you can switch the Format to show full nodes instead of teasers.


This will work "automatically" for all Taxonomy terms. The reason this works is that the view takes an argument of the taxonomy term in the URL. 



It overrides Drupal core's url for Taxonomy terms and uses the view as a replacement.