ArsClip is a freeware 'clipboard manager' utility. ArsClip monitors the clipboard and keeps track of the entries. Pasting is done by using a triggered popup window. This window can be triggered by a hotkey, holding right-click, a special trigger window, and other methods.
ArsClip used to be barebones, but I think I can safely say that it has become a nicely featured and highly configurable program, due to user feedback. The program now specializes in copy-and-paste automation tasks.