Dragbox is a tool for connecting the commandline with the desktop environment. It summons a drag handle when you are managing files or information in a shell. It accepts both drags and drops, and can be made to output dragged-to items to the standard output. You can also pipe text to Dragbox, or a list of files using xargs.
I'm happy that you like it! Dragbox could be extended in a number of ways, perhaps by being a drawer in the panel. I haven't worked on Dragbox for some time though, when I have time I spend it on http://kaizer.se/wiki/kupfer/