So far, iClip is my favorite app from the MacHeist bundle. I'm experimenting with it, deciding which hot keys to use for what and when/where I want the iClip window to appear, but it already helps me quite a bit. My editing paradigm can shift, since instead of always doing copy/paste, copy/paste, copy/paste when reorganizing information, I can also copy, copy, copy, and then paste, paste, paste, with a little help from iClip.
I think that operating system should provide multiple clipboard features (a push-down clipboard stack with ways to reorder the stack), but until then this utility should do just fine. I might have to pick up a few more copies of it.