Includes swapping files and Real time editing at any time on the console.
Here is my tutorial on how to take screenshots on your Jtag using the Xbox 360 SDK, with the XBDM plugin.
XBDM is a plugin that is currently being developed for Jtagged Xbox 360, it allows features normally only available on Xbox 360 Developers Kits to be used on Jtagged Xbox 360's.