XShelf is an application that enhances Drag and Drop operations in Mac OS X by providing a shelf where Drag and Dropped items (such as files, text, or URLs) can be stored for later use. Thus, not only can Drag and Drop operations be "paused", multiple operations can be in flight at once.
What's new in XShelf
Updated for OS X 10.5 Leopard. Due to lack of time or resources, this version is only tested on 10.4 and later.
Fitt's revenge. Items can be dropped without backing away from the edge of the screen (though the highlight doesn't appear).
Fixed a bug where, if you had the context menu open, clicking away would leave the drawer open.