DropCopy

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Easily and quickly send files and folders to multiple destinations across your LAN by simply dragging files onto recipients in a popup window. 
The easiest way to get things from one place to another quickly without dialogs, passwords or confirmations. DropCopy is free for personal use 
(up to 3 machines on a network) and $25 for larger networks but donations are always welcome.

 MacWorld says: “It’s become one of the first things I install on any new Mac” - read the full review here. 

Watch DropCopy in action: 

Also see Mobile DropCopy for iPod/iPhone

Download DropCopy 1.4.7 (Leopard and Tiger)