Windows only: Portable system tweaking utility ShellMenuNew displays a list of all the items in the Windows Explorer "New" menu, and allows you to disable them easily.
ShellMenuView works just like the rest of the excellent NirSoft utilities — you can view all of the menu items, enable or disable them, export the list to a file, or hop directly to the registry entry to make some direct tweaks to the items. The Nirsoft documentation notes that you willl need to re-open the Windows context menu's "New" folder twice for the changes to kick in.
ShellMenuView is a free download for Windows users only. There's no installation required, so you can drop this utility onto your Flash drive toolkit.