Clipstep which i use if i have to remember three to four copy and pastes.
Dragking which copies what ever you select and you can assign a key to paste what is copied. Like the middle mouse button etc. This will really come in handy if you do a lot of copy and pasting from one page to the other.
There are plenty of other programs that you might find useful. The best part is all of them are .exe files and need no installation.