Sorry, but "Dropbox for WiFi" pretty immediately invokes a product like Apple's AirDrop feature, where one can--to quote from Apple's site[1]--"[d]rag and drop a file to send it wirelessly to someone on the same network."

This is exactly what I expected to see the app do--ad hoc file sharing between devices on the same network.

You have chosen a poor descriptor.

[1]: http://www.apple.com/osx/whats-new/#sharing