A to Z Clipboard is a free utility which allows you to copy up to 25 times before pasting. (Unlike the Windows clipboard which only allows you to copy once.) The small clipboard window floats above your work and you can see the first few words of each clip to remind you what they are. When you put the mouse over a clip, you see more of it in an optional pop up preview window. A to Z handles graphic clips as well as text. You can also see those in the preview window.
As well as capturing clips as you take them, A to Z also includes editors for both text and graphics so you can create or edit your clips within the program. The graphics editor is particularly useful for mixing screen shots with text or other graphics before pasting.