Print management

I hope somebody can point me in the right direction. I am trying to find a product or method to allow my users to print to an intermediate print queue, location or holding area rather than immediatley to the printer. This will allow them, when ready, to release or send all those prints to the networked printer with a simple one-touch operation. We can do this via the multifunction copiers but would prefer to find a method to release it from the desktop. Any ideas or suggestions would be greatly appreciated.
Carlos.