This will change your life

OK, maybe the headline might be a bit strong. Especially if you don't use InDesign everyday. But if you do, you need to get LayoutZone. And best of all it won't cost you a cent.

LayoutZone allows multiple InDesign users to work on different sections of the same page simultaneously and with more control. LayoutZone lets you quickly select several InDesign page elements or frames and automatically convert them to a Placed InDesign file (.indd) for editing outside the master document. Once external editing is complete, a seamless round trip workflow automatically converts the linked InDesign file back into native objects.

See it in action here.