Lightweight utility CopyPasteTool saves multiple strings of clipboard text, and then cycles between them easily using the keyboard.
Once installed, the utility puts an icon in your system tray—but otherwise runs completely in the background with very little memory usage. To use the new function, simply copy a couple of different pieces of text to the clipboard, and then hold down the Control key while hitting the V key more than once, and the utility will cycle through the various pieces of text on the clipboard. Its tiny, simple, and is meant to do just one thing.