Slightly different implementation, but will do what you want:

[LaunchBar][1] keeps a history of your clipboard, so you can copy multiple things using the usual keyboard combo <kbd>⌘</kbd> - <kbd>C</kbd> and then paste them using (for me, I may have changed from the default):

 - hold down <kbd>⌘</kbd>
  - tap <kbd>\</kbd> to view clipboard history
  - tap <kbd>&#x2193;</kbd> until desired clipping is selected
 - release <kbd>⌘</kbd>

I've found it to be a pretty useful workflow. I do have to flush the clipboard history after dealing with passwords though. I keep it set at 10 items to limit my exposure if I forget.

Launchbar is free to try and $35 to buy.


  [1]: http://www.obdev.at/products/launchbar/index.html