I have been using MVC Editor & Display Templates for a while, but have come to realize that there seems to be very little official documentation on MVC Editor/Display Te
Official documentation? Don't know any off hand, but I know there are a ton of examples. In particular, I like Phil Haack's discussion on model binding to lists. It includes an example for an editor template in a pretty complicated example. There's source code there, too.
Since he's co-authored every MVC Wrox book, I consider him a pretty definitive source:
http://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx
Here's another blog post (non-official) in a similar vein:
http://blogs.msdn.com/b/stuartleeks/archive/2010/03/30/collections-and-asp-net-mvc-templated-helpers-displayfor-editorfor.aspx