The "space" trick is useful in many other cases as well, even with files in a single folder! Actually, any printable character in the ACSII list that comes before "0" ( zero ) will work ( assuming the OS will accept it in a file name ). And numbers work fine in most Apple OSs because in ASCII, they come before the letters; the OS uses this positioning to sort by names.
I haven't tried DropCopy. I just double-click the icon on my desktop for my wife's iBook ( and she has one for my iGloo ) which opens a Finder window of the other drive. I can then navigate to most any location I want. This does depend on a fixed IP address for each computer but you can also use the "Go" menu if you don't use those.
