Changing Content Types for a Sub-Folder in a Document Library
Here's a neat trick Elad Barkan revealed to me:
Set up a Document Library so it will have several Content Types assigned to it (using the Advanced Settings).
So here's the Document Library's New Menu: | 
|
Now create a new Folder in it, we'll just call it "Subdirectory" for the sample.
Pop up the context menu.. did you notice the Change New Button Order Item? Let's click it! | 
|
Now we get this cool page, in which we can change the appearance of Content Types in the selected folder:
|
In the image above you can see the new order and settings I chose.
Now to the right, here's the New Menu inside the created folder. (Notice the breadcrumbs.)
Cool! |  |
Dor Rotman.