This question has been asked many times: "Each folder in my document library must have a different content type, is this possible?"
The only reason for me posting this is that MANY people think that you are unable to associate a content type to a specific folder, when in fact you can and is very easy to do:
- Add all the content types that you are going to use for each of your folders to the document library (dont panic, the users will not see all of them!).
- Create a new folder.
- Open the drop-down context menu for the folder and select the "change new button order" link. (yes, it is actually this simple)
- Select the content types that should be displayed when the user is in this folder.
NOTE: This will not affect the content type selection on the Upload page though, users will still be able to select from all content types when uploading a document.