M8 Multi lets you save up to 25 clips on the clipboard for pasting at a later point. If the clip is text, you can see several lines and if it is a graphic, you can see a thumbnail instead which is absolutely brilliant for working out what and what you haven't used. The program works well too, staying hidden in the taskbar until you need it, when you can access the 25 last captures. Simply by rolling over each one, a preview is generated.
You can make the program even quicker to access through the use of shortcut keys, choosing your own key combinations to access particular functions, such as capturing the full screen, a single window, a menu within a window, etc. to capture the entire screen you simply press Prt Scr, to capture the active window press Alt+PrtScr and to capture an individual graphic point to the graphic, right click and select "Copy" from the drop down list. M8 is great for making multiple captures to your clipboard.