This looks cool:
With XShelf 1.1.2 you can drag files or folders from Finder into the shelf and they will sit there until you drag them out. Once you drag them out, the drag operation will finish as if XShelf were never involved. You may drag individual or multiple files or folders, as well as text clippings and URLs to XShelf. With XShelf, you no longer have to shuffle windows so that both the source and target of a drag and drop are onscreen at the same time.
I do a lot of moving information around between applications. This could be very handy.